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Finding the Fourth Proportional to 711.36, 1,065.33 and 385.92

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Solution

The fourth proportional to 711.36, 1,065.33 and 385.92 is: 577.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.36 : 1,065.33 = 385.92 : x
  2. Step 2: Convert to fraction form
    711.36/1,065.33 = 385.92/x
  3. Step 3: Cross multiply
    711.36x = 1,065.33 × 385.92
  4. Step 4: Simplify right side
    711.36x = 411,132.15
  5. Step 5: Solve for x
    x = 411,132.15/711.36
  6. Step 6: Final answer
    x = 577.95

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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.