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Finding the Fourth Proportional to 724.05, 1,084.25 and 621.99

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Solution

The fourth proportional to 724.05, 1,084.25 and 621.99 is: 931.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.05 : 1,084.25 = 621.99 : x
  2. Step 2: Convert to fraction form
    724.05/1,084.25 = 621.99/x
  3. Step 3: Cross multiply
    724.05x = 1,084.25 × 621.99
  4. Step 4: Simplify right side
    724.05x = 674,394.21
  5. Step 5: Solve for x
    x = 674,394.21/724.05
  6. Step 6: Final answer
    x = 931.42

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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.