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Finding the Fourth Proportional to 711.11, 1,066.21 and 381.85

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Solution

The fourth proportional to 711.11, 1,066.21 and 381.85 is: 572.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.11 : 1,066.21 = 381.85 : x
  2. Step 2: Convert to fraction form
    711.11/1,066.21 = 381.85/x
  3. Step 3: Cross multiply
    711.11x = 1,066.21 × 381.85
  4. Step 4: Simplify right side
    711.11x = 407,128.67
  5. Step 5: Solve for x
    x = 407,128.67/711.11
  6. Step 6: Final answer
    x = 572.52

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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.