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Finding the Fourth Proportional to 1,008.72, 1,392.21 and 615.96

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Solution

The fourth proportional to 1,008.72, 1,392.21 and 615.96 is: 850.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.72 : 1,392.21 = 615.96 : x
  2. Step 2: Convert to fraction form
    1,008.72/1,392.21 = 615.96/x
  3. Step 3: Cross multiply
    1,008.72x = 1,392.21 × 615.96
  4. Step 4: Simplify right side
    1,008.72x = 857,545.67
  5. Step 5: Solve for x
    x = 857,545.67/1,008.72
  6. Step 6: Final answer
    x = 850.13

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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.