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Finding the Fourth Proportional to 731.95, 1,096.78 and 457.21

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Solution

The fourth proportional to 731.95, 1,096.78 and 457.21 is: 685.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.95 : 1,096.78 = 457.21 : x
  2. Step 2: Convert to fraction form
    731.95/1,096.78 = 457.21/x
  3. Step 3: Cross multiply
    731.95x = 1,096.78 × 457.21
  4. Step 4: Simplify right side
    731.95x = 501,454.90
  5. Step 5: Solve for x
    x = 501,454.90/731.95
  6. Step 6: Final answer
    x = 685.10

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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.