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Finding the Fourth Proportional to 724.23, 1,087.20 and 518.25

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Solution

The fourth proportional to 724.23, 1,087.20 and 518.25 is: 777.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.23 : 1,087.20 = 518.25 : x
  2. Step 2: Convert to fraction form
    724.23/1,087.20 = 518.25/x
  3. Step 3: Cross multiply
    724.23x = 1,087.20 × 518.25
  4. Step 4: Simplify right side
    724.23x = 563,441.40
  5. Step 5: Solve for x
    x = 563,441.40/724.23
  6. Step 6: Final answer
    x = 777.99

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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.