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Finding the Fourth Proportional to 981.82, 1,472.82 and 434.08

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Solution

The fourth proportional to 981.82, 1,472.82 and 434.08 is: 651.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.82 : 1,472.82 = 434.08 : x
  2. Step 2: Convert to fraction form
    981.82/1,472.82 = 434.08/x
  3. Step 3: Cross multiply
    981.82x = 1,472.82 × 434.08
  4. Step 4: Simplify right side
    981.82x = 639,321.71
  5. Step 5: Solve for x
    x = 639,321.71/981.82
  6. Step 6: Final answer
    x = 651.16

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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.