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Finding the Fourth Proportional to 1,008.09, 1,391.11 and 615.04

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Solution

The fourth proportional to 1,008.09, 1,391.11 and 615.04 is: 848.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.09 : 1,391.11 = 615.04 : x
  2. Step 2: Convert to fraction form
    1,008.09/1,391.11 = 615.04/x
  3. Step 3: Cross multiply
    1,008.09x = 1,391.11 × 615.04
  4. Step 4: Simplify right side
    1,008.09x = 855,583.28
  5. Step 5: Solve for x
    x = 855,583.28/1,008.09
  6. Step 6: Final answer
    x = 848.72

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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.