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Finding the Fourth Proportional to 781.11, 1,077.91 and 431.77

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Solution

The fourth proportional to 781.11, 1,077.91 and 431.77 is: 595.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.11 : 1,077.91 = 431.77 : x
  2. Step 2: Convert to fraction form
    781.11/1,077.91 = 431.77/x
  3. Step 3: Cross multiply
    781.11x = 1,077.91 × 431.77
  4. Step 4: Simplify right side
    781.11x = 465,409.20
  5. Step 5: Solve for x
    x = 465,409.20/781.11
  6. Step 6: Final answer
    x = 595.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.