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Finding the Fourth Proportional to 931.79, 1,397.88 and 282.57

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Solution

The fourth proportional to 931.79, 1,397.88 and 282.57 is: 423.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.79 : 1,397.88 = 282.57 : x
  2. Step 2: Convert to fraction form
    931.79/1,397.88 = 282.57/x
  3. Step 3: Cross multiply
    931.79x = 1,397.88 × 282.57
  4. Step 4: Simplify right side
    931.79x = 394,998.95
  5. Step 5: Solve for x
    x = 394,998.95/931.79
  6. Step 6: Final answer
    x = 423.92

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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.