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Finding the Fourth Proportional to 913.92, 1,261.20 and 520.88

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Solution

The fourth proportional to 913.92, 1,261.20 and 520.88 is: 718.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.92 : 1,261.20 = 520.88 : x
  2. Step 2: Convert to fraction form
    913.92/1,261.20 = 520.88/x
  3. Step 3: Cross multiply
    913.92x = 1,261.20 × 520.88
  4. Step 4: Simplify right side
    913.92x = 656,933.86
  5. Step 5: Solve for x
    x = 656,933.86/913.92
  6. Step 6: Final answer
    x = 718.81

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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.