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Finding the Fourth Proportional to 913.80, 1,261.11 and 520.86

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Solution

The fourth proportional to 913.80, 1,261.11 and 520.86 is: 718.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.80 : 1,261.11 = 520.86 : x
  2. Step 2: Convert to fraction form
    913.80/1,261.11 = 520.86/x
  3. Step 3: Cross multiply
    913.80x = 1,261.11 × 520.86
  4. Step 4: Simplify right side
    913.80x = 656,861.75
  5. Step 5: Solve for x
    x = 656,861.75/913.80
  6. Step 6: Final answer
    x = 718.82

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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.