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Finding the Fourth Proportional to 724.99, 1,087.78 and 465.28

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Solution

The fourth proportional to 724.99, 1,087.78 and 465.28 is: 698.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.99 : 1,087.78 = 465.28 : x
  2. Step 2: Convert to fraction form
    724.99/1,087.78 = 465.28/x
  3. Step 3: Cross multiply
    724.99x = 1,087.78 × 465.28
  4. Step 4: Simplify right side
    724.99x = 506,122.28
  5. Step 5: Solve for x
    x = 506,122.28/724.99
  6. Step 6: Final answer
    x = 698.11

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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.