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Finding the Fourth Proportional to 928.71, 1,393.14 and 381.02

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Solution

The fourth proportional to 928.71, 1,393.14 and 381.02 is: 571.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.71 : 1,393.14 = 381.02 : x
  2. Step 2: Convert to fraction form
    928.71/1,393.14 = 381.02/x
  3. Step 3: Cross multiply
    928.71x = 1,393.14 × 381.02
  4. Step 4: Simplify right side
    928.71x = 530,807.24
  5. Step 5: Solve for x
    x = 530,807.24/928.71
  6. Step 6: Final answer
    x = 571.55

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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.