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Finding the Fourth Proportional to 913.68, 1,260.88 and 520.72

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Solution

The fourth proportional to 913.68, 1,260.88 and 520.72 is: 718.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.68 : 1,260.88 = 520.72 : x
  2. Step 2: Convert to fraction form
    913.68/1,260.88 = 520.72/x
  3. Step 3: Cross multiply
    913.68x = 1,260.88 × 520.72
  4. Step 4: Simplify right side
    913.68x = 656,565.43
  5. Step 5: Solve for x
    x = 656,565.43/913.68
  6. Step 6: Final answer
    x = 718.59

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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.