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Finding the Fourth Proportional to 913.58, 1,260.62 and 515.18

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Solution

The fourth proportional to 913.58, 1,260.62 and 515.18 is: 710.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.58 : 1,260.62 = 515.18 : x
  2. Step 2: Convert to fraction form
    913.58/1,260.62 = 515.18/x
  3. Step 3: Cross multiply
    913.58x = 1,260.62 × 515.18
  4. Step 4: Simplify right side
    913.58x = 649,446.21
  5. Step 5: Solve for x
    x = 649,446.21/913.58
  6. Step 6: Final answer
    x = 710.88

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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.