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Finding the Fourth Proportional to 1,170.80, 1,619.80 and 1,145.20

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Solution

The fourth proportional to 1,170.80, 1,619.80 and 1,145.20 is: 1,584.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.80 : 1,619.80 = 1,145.20 : x
  2. Step 2: Convert to fraction form
    1,170.80/1,619.80 = 1,145.20/x
  3. Step 3: Cross multiply
    1,170.80x = 1,619.80 × 1,145.20
  4. Step 4: Simplify right side
    1,170.80x = 1,854,994.96
  5. Step 5: Solve for x
    x = 1,854,994.96/1,170.80
  6. Step 6: Final answer
    x = 1,584.38

Related Problems

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Half scale
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Double scale
Find fourth proportional to 1,171.80, 1,621.18 and 1,146.20
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.