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Finding the Fourth Proportional to 1,008.60, 1,391.78 and 615.52

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Solution

The fourth proportional to 1,008.60, 1,391.78 and 615.52 is: 849.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.60 : 1,391.78 = 615.52 : x
  2. Step 2: Convert to fraction form
    1,008.60/1,391.78 = 615.52/x
  3. Step 3: Cross multiply
    1,008.60x = 1,391.78 × 615.52
  4. Step 4: Simplify right side
    1,008.60x = 856,668.43
  5. Step 5: Solve for x
    x = 856,668.43/1,008.60
  6. Step 6: Final answer
    x = 849.36

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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.