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Finding the Fourth Proportional to 1,008.56, 1,391.48 and 615.44

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Solution

The fourth proportional to 1,008.56, 1,391.48 and 615.44 is: 849.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.56 : 1,391.48 = 615.44 : x
  2. Step 2: Convert to fraction form
    1,008.56/1,391.48 = 615.44/x
  3. Step 3: Cross multiply
    1,008.56x = 1,391.48 × 615.44
  4. Step 4: Simplify right side
    1,008.56x = 856,372.45
  5. Step 5: Solve for x
    x = 856,372.45/1,008.56
  6. Step 6: Final answer
    x = 849.10

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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.