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Finding the Fourth Proportional to 981.67, 1,472.14 and 288.16

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Solution

The fourth proportional to 981.67, 1,472.14 and 288.16 is: 432.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.67 : 1,472.14 = 288.16 : x
  2. Step 2: Convert to fraction form
    981.67/1,472.14 = 288.16/x
  3. Step 3: Cross multiply
    981.67x = 1,472.14 × 288.16
  4. Step 4: Simplify right side
    981.67x = 424,203.78
  5. Step 5: Solve for x
    x = 424,203.78/981.67
  6. Step 6: Final answer
    x = 432.13

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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.