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Finding the Fourth Proportional to 723.05, 1,084.80 and 430.49

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Solution

The fourth proportional to 723.05, 1,084.80 and 430.49 is: 645.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.05 : 1,084.80 = 430.49 : x
  2. Step 2: Convert to fraction form
    723.05/1,084.80 = 430.49/x
  3. Step 3: Cross multiply
    723.05x = 1,084.80 × 430.49
  4. Step 4: Simplify right side
    723.05x = 466,990.13
  5. Step 5: Solve for x
    x = 466,990.13/723.05
  6. Step 6: Final answer
    x = 645.87

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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.