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Finding the Fourth Proportional to 913.72, 1,260.96 and 520.72

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Solution

The fourth proportional to 913.72, 1,260.96 and 520.72 is: 718.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.72 : 1,260.96 = 520.72 : x
  2. Step 2: Convert to fraction form
    913.72/1,260.96 = 520.72/x
  3. Step 3: Cross multiply
    913.72x = 1,260.96 × 520.72
  4. Step 4: Simplify right side
    913.72x = 656,607.09
  5. Step 5: Solve for x
    x = 656,607.09/913.72
  6. Step 6: Final answer
    x = 718.61

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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.