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Finding the Fourth Proportional to 1,572.81, 2,170.55 and 874.19

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Solution

The fourth proportional to 1,572.81, 2,170.55 and 874.19 is: 1,206.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.81 : 2,170.55 = 874.19 : x
  2. Step 2: Convert to fraction form
    1,572.81/2,170.55 = 874.19/x
  3. Step 3: Cross multiply
    1,572.81x = 2,170.55 × 874.19
  4. Step 4: Simplify right side
    1,572.81x = 1,897,473.10
  5. Step 5: Solve for x
    x = 1,897,473.10/1,572.81
  6. Step 6: Final answer
    x = 1,206.42

Related Problems

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Half scale
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Double scale
Find fourth proportional to 1,573.81, 2,171.93 and 875.19
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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.