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Finding the Fourth Proportional to 717.80, 990.48 and 423.12

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Solution

The fourth proportional to 717.80, 990.48 and 423.12 is: 583.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.80 : 990.48 = 423.12 : x
  2. Step 2: Convert to fraction form
    717.80/990.48 = 423.12/x
  3. Step 3: Cross multiply
    717.80x = 990.48 × 423.12
  4. Step 4: Simplify right side
    717.80x = 419,091.90
  5. Step 5: Solve for x
    x = 419,091.90/717.80
  6. Step 6: Final answer
    x = 583.86

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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.