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Finding the Fourth Proportional to 929.92, 1,393.72 and 381.80

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Solution

The fourth proportional to 929.92, 1,393.72 and 381.80 is: 572.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.92 : 1,393.72 = 381.80 : x
  2. Step 2: Convert to fraction form
    929.92/1,393.72 = 381.80/x
  3. Step 3: Cross multiply
    929.92x = 1,393.72 × 381.80
  4. Step 4: Simplify right side
    929.92x = 532,122.30
  5. Step 5: Solve for x
    x = 532,122.30/929.92
  6. Step 6: Final answer
    x = 572.22

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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.