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Finding the Fourth Proportional to 931.69, 1,397.76 and 315.53

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Solution

The fourth proportional to 931.69, 1,397.76 and 315.53 is: 473.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.69 : 1,397.76 = 315.53 : x
  2. Step 2: Convert to fraction form
    931.69/1,397.76 = 315.53/x
  3. Step 3: Cross multiply
    931.69x = 1,397.76 × 315.53
  4. Step 4: Simplify right side
    931.69x = 441,035.21
  5. Step 5: Solve for x
    x = 441,035.21/931.69
  6. Step 6: Final answer
    x = 473.37

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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.