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Finding the Fourth Proportional to 987.26, 1,480.89 and 402.13

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Solution

The fourth proportional to 987.26, 1,480.89 and 402.13 is: 603.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.26 : 1,480.89 = 402.13 : x
  2. Step 2: Convert to fraction form
    987.26/1,480.89 = 402.13/x
  3. Step 3: Cross multiply
    987.26x = 1,480.89 × 402.13
  4. Step 4: Simplify right side
    987.26x = 595,516.69
  5. Step 5: Solve for x
    x = 595,516.69/987.26
  6. Step 6: Final answer
    x = 603.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.