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Finding the Fourth Proportional to 1,008.59, 1,390.86 and 615.38

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Solution

The fourth proportional to 1,008.59, 1,390.86 and 615.38 is: 848.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.59 : 1,390.86 = 615.38 : x
  2. Step 2: Convert to fraction form
    1,008.59/1,390.86 = 615.38/x
  3. Step 3: Cross multiply
    1,008.59x = 1,390.86 × 615.38
  4. Step 4: Simplify right side
    1,008.59x = 855,910.90
  5. Step 5: Solve for x
    x = 855,910.90/1,008.59
  6. Step 6: Final answer
    x = 848.62

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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.