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Finding the Fourth Proportional to 929.98, 1,393.76 and 381.86

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Solution

The fourth proportional to 929.98, 1,393.76 and 381.86 is: 572.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.98 : 1,393.76 = 381.86 : x
  2. Step 2: Convert to fraction form
    929.98/1,393.76 = 381.86/x
  3. Step 3: Cross multiply
    929.98x = 1,393.76 × 381.86
  4. Step 4: Simplify right side
    929.98x = 532,221.19
  5. Step 5: Solve for x
    x = 532,221.19/929.98
  6. Step 6: Final answer
    x = 572.29

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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.