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Finding the Fourth Proportional to 1,008.25, 1,391.63 and 615.61

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Solution

The fourth proportional to 1,008.25, 1,391.63 and 615.61 is: 849.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.25 : 1,391.63 = 615.61 : x
  2. Step 2: Convert to fraction form
    1,008.25/1,391.63 = 615.61/x
  3. Step 3: Cross multiply
    1,008.25x = 1,391.63 × 615.61
  4. Step 4: Simplify right side
    1,008.25x = 856,691.31
  5. Step 5: Solve for x
    x = 856,691.31/1,008.25
  6. Step 6: Final answer
    x = 849.68

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1.5x scale

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.