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Finding the Fourth Proportional to 860.27, 1,287.66 and 615.60

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Solution

The fourth proportional to 860.27, 1,287.66 and 615.60 is: 921.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.27 : 1,287.66 = 615.60 : x
  2. Step 2: Convert to fraction form
    860.27/1,287.66 = 615.60/x
  3. Step 3: Cross multiply
    860.27x = 1,287.66 × 615.60
  4. Step 4: Simplify right side
    860.27x = 792,677.06
  5. Step 5: Solve for x
    x = 792,677.06/860.27
  6. Step 6: Final answer
    x = 921.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.