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Finding the Fourth Proportional to 913.92, 1,261.20 and 540.72

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Solution

The fourth proportional to 913.92, 1,261.20 and 540.72 is: 746.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.92 : 1,261.20 = 540.72 : x
  2. Step 2: Convert to fraction form
    913.92/1,261.20 = 540.72/x
  3. Step 3: Cross multiply
    913.92x = 1,261.20 × 540.72
  4. Step 4: Simplify right side
    913.92x = 681,956.06
  5. Step 5: Solve for x
    x = 681,956.06/913.92
  6. Step 6: Final answer
    x = 746.19

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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.