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Finding the Fourth Proportional to 931.38, 1,397.21 and 306.48

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Solution

The fourth proportional to 931.38, 1,397.21 and 306.48 is: 459.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.38 : 1,397.21 = 306.48 : x
  2. Step 2: Convert to fraction form
    931.38/1,397.21 = 306.48/x
  3. Step 3: Cross multiply
    931.38x = 1,397.21 × 306.48
  4. Step 4: Simplify right side
    931.38x = 428,216.92
  5. Step 5: Solve for x
    x = 428,216.92/931.38
  6. Step 6: Final answer
    x = 459.77

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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.