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Finding the Fourth Proportional to 913.81, 1,261.07 and 520.87

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Solution

The fourth proportional to 913.81, 1,261.07 and 520.87 is: 718.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.81 : 1,261.07 = 520.87 : x
  2. Step 2: Convert to fraction form
    913.81/1,261.07 = 520.87/x
  3. Step 3: Cross multiply
    913.81x = 1,261.07 × 520.87
  4. Step 4: Simplify right side
    913.81x = 656,853.53
  5. Step 5: Solve for x
    x = 656,853.53/913.81
  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.