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Finding the Fourth Proportional to 731.20, 1,024.40 and 731.20

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Solution

The fourth proportional to 731.20, 1,024.40 and 731.20 is: 1,024.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.20 : 1,024.40 = 731.20 : x
  2. Step 2: Convert to fraction form
    731.20/1,024.40 = 731.20/x
  3. Step 3: Cross multiply
    731.20x = 1,024.40 × 731.20
  4. Step 4: Simplify right side
    731.20x = 749,041.28
  5. Step 5: Solve for x
    x = 749,041.28/731.20
  6. Step 6: Final answer
    x = 1,024.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.