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Finding the Fourth Proportional to 913.75, 1,260.92 and 515.42

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Solution

The fourth proportional to 913.75, 1,260.92 and 515.42 is: 711.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.75 : 1,260.92 = 515.42 : x
  2. Step 2: Convert to fraction form
    913.75/1,260.92 = 515.42/x
  3. Step 3: Cross multiply
    913.75x = 1,260.92 × 515.42
  4. Step 4: Simplify right side
    913.75x = 649,898.37
  5. Step 5: Solve for x
    x = 649,898.37/913.75
  6. Step 6: Final answer
    x = 711.25

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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.