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Finding the Fourth Proportional to 955.10, 1,432.60 and 724.40

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Solution

The fourth proportional to 955.10, 1,432.60 and 724.40 is: 1,086.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.10 : 1,432.60 = 724.40 : x
  2. Step 2: Convert to fraction form
    955.10/1,432.60 = 724.40/x
  3. Step 3: Cross multiply
    955.10x = 1,432.60 × 724.40
  4. Step 4: Simplify right side
    955.10x = 1,037,775.44
  5. Step 5: Solve for x
    x = 1,037,775.44/955.10
  6. Step 6: Final answer
    x = 1,086.56

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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.