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Finding the Fourth Proportional to 913.76, 1,261.01 and 520.79

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Solution

The fourth proportional to 913.76, 1,261.01 and 520.79 is: 718.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.76 : 1,261.01 = 520.79 : x
  2. Step 2: Convert to fraction form
    913.76/1,261.01 = 520.79/x
  3. Step 3: Cross multiply
    913.76x = 1,261.01 × 520.79
  4. Step 4: Simplify right side
    913.76x = 656,712.49
  5. Step 5: Solve for x
    x = 656,712.49/913.76
  6. Step 6: Final answer
    x = 718.70

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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.