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Finding the Fourth Proportional to 1,008.92, 1,391.90 and 615.80

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Solution

The fourth proportional to 1,008.92, 1,391.90 and 615.80 is: 849.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.92 : 1,391.90 = 615.80 : x
  2. Step 2: Convert to fraction form
    1,008.92/1,391.90 = 615.80/x
  3. Step 3: Cross multiply
    1,008.92x = 1,391.90 × 615.80
  4. Step 4: Simplify right side
    1,008.92x = 857,132.02
  5. Step 5: Solve for x
    x = 857,132.02/1,008.92
  6. Step 6: Final answer
    x = 849.55

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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.