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Finding the Fourth Proportional to 981.78, 1,472.13 and 433.68

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Solution

The fourth proportional to 981.78, 1,472.13 and 433.68 is: 650.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.78 : 1,472.13 = 433.68 : x
  2. Step 2: Convert to fraction form
    981.78/1,472.13 = 433.68/x
  3. Step 3: Cross multiply
    981.78x = 1,472.13 × 433.68
  4. Step 4: Simplify right side
    981.78x = 638,433.34
  5. Step 5: Solve for x
    x = 638,433.34/981.78
  6. Step 6: Final answer
    x = 650.28

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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.