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Finding the Fourth Proportional to 1,139.57, 1,572.60 and 615.60

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Solution

The fourth proportional to 1,139.57, 1,572.60 and 615.60 is: 849.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.57 : 1,572.60 = 615.60 : x
  2. Step 2: Convert to fraction form
    1,139.57/1,572.60 = 615.60/x
  3. Step 3: Cross multiply
    1,139.57x = 1,572.60 × 615.60
  4. Step 4: Simplify right side
    1,139.57x = 968,081.62
  5. Step 5: Solve for x
    x = 968,081.62/1,139.57
  6. Step 6: Final answer
    x = 849.52

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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.