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Finding the Fourth Proportional to 1,008.18, 1,391.04 and 615.06

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Solution

The fourth proportional to 1,008.18, 1,391.04 and 615.06 is: 848.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.18 : 1,391.04 = 615.06 : x
  2. Step 2: Convert to fraction form
    1,008.18/1,391.04 = 615.06/x
  3. Step 3: Cross multiply
    1,008.18x = 1,391.04 × 615.06
  4. Step 4: Simplify right side
    1,008.18x = 855,573.06
  5. Step 5: Solve for x
    x = 855,573.06/1,008.18
  6. Step 6: Final answer
    x = 848.63

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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.