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Finding the Fourth Proportional to 1,613.28, 2,419.92 and 517.72

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Solution

The fourth proportional to 1,613.28, 2,419.92 and 517.72 is: 776.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.28 : 2,419.92 = 517.72 : x
  2. Step 2: Convert to fraction form
    1,613.28/2,419.92 = 517.72/x
  3. Step 3: Cross multiply
    1,613.28x = 2,419.92 × 517.72
  4. Step 4: Simplify right side
    1,613.28x = 1,252,840.98
  5. Step 5: Solve for x
    x = 1,252,840.98/1,613.28
  6. Step 6: Final answer
    x = 776.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.