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Finding the Fourth Proportional to 931.58, 1,397.52 and 315.28

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Solution

The fourth proportional to 931.58, 1,397.52 and 315.28 is: 472.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.58 : 1,397.52 = 315.28 : x
  2. Step 2: Convert to fraction form
    931.58/1,397.52 = 315.28/x
  3. Step 3: Cross multiply
    931.58x = 1,397.52 × 315.28
  4. Step 4: Simplify right side
    931.58x = 440,606.61
  5. Step 5: Solve for x
    x = 440,606.61/931.58
  6. Step 6: Final answer
    x = 472.97

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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.