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Finding the Fourth Proportional to 711.38, 1,065.72 and 385.76

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Solution

The fourth proportional to 711.38, 1,065.72 and 385.76 is: 577.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.38 : 1,065.72 = 385.76 : x
  2. Step 2: Convert to fraction form
    711.38/1,065.72 = 385.76/x
  3. Step 3: Cross multiply
    711.38x = 1,065.72 × 385.76
  4. Step 4: Simplify right side
    711.38x = 411,112.15
  5. Step 5: Solve for x
    x = 411,112.15/711.38
  6. Step 6: Final answer
    x = 577.91

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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.