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Finding the Fourth Proportional to 723.65, 998.47 and 428.76

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Solution

The fourth proportional to 723.65, 998.47 and 428.76 is: 591.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.65 : 998.47 = 428.76 : x
  2. Step 2: Convert to fraction form
    723.65/998.47 = 428.76/x
  3. Step 3: Cross multiply
    723.65x = 998.47 × 428.76
  4. Step 4: Simplify right side
    723.65x = 428,104.00
  5. Step 5: Solve for x
    x = 428,104.00/723.65
  6. Step 6: Final answer
    x = 591.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.