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Finding the Fourth Proportional to 929.56, 1,393.72 and 381.59

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Solution

The fourth proportional to 929.56, 1,393.72 and 381.59 is: 572.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.56 : 1,393.72 = 381.59 : x
  2. Step 2: Convert to fraction form
    929.56/1,393.72 = 381.59/x
  3. Step 3: Cross multiply
    929.56x = 1,393.72 × 381.59
  4. Step 4: Simplify right side
    929.56x = 531,829.61
  5. Step 5: Solve for x
    x = 531,829.61/929.56
  6. Step 6: Final answer
    x = 572.13

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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.