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Finding the Fourth Proportional to 1,642.68, 2,266.36 and 1,170.65

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Solution

The fourth proportional to 1,642.68, 2,266.36 and 1,170.65 is: 1,615.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,642.68 : 2,266.36 = 1,170.65 : x
  2. Step 2: Convert to fraction form
    1,642.68/2,266.36 = 1,170.65/x
  3. Step 3: Cross multiply
    1,642.68x = 2,266.36 × 1,170.65
  4. Step 4: Simplify right side
    1,642.68x = 2,653,114.33
  5. Step 5: Solve for x
    x = 2,653,114.33/1,642.68
  6. Step 6: Final answer
    x = 1,615.11

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Half scale
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Double scale
Find fourth proportional to 1,643.68, 2,267.74 and 1,171.65
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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.