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Finding the Fourth Proportional to 739.76, 1,025.66 and 712.40

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Solution

The fourth proportional to 739.76, 1,025.66 and 712.40 is: 987.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.76 : 1,025.66 = 712.40 : x
  2. Step 2: Convert to fraction form
    739.76/1,025.66 = 712.40/x
  3. Step 3: Cross multiply
    739.76x = 1,025.66 × 712.40
  4. Step 4: Simplify right side
    739.76x = 730,680.18
  5. Step 5: Solve for x
    x = 730,680.18/739.76
  6. Step 6: Final answer
    x = 987.73

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.