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Finding the Fourth Proportional to 717.55, 990.26 and 423.01

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Solution

The fourth proportional to 717.55, 990.26 and 423.01 is: 583.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.55 : 990.26 = 423.01 : x
  2. Step 2: Convert to fraction form
    717.55/990.26 = 423.01/x
  3. Step 3: Cross multiply
    717.55x = 990.26 × 423.01
  4. Step 4: Simplify right side
    717.55x = 418,889.88
  5. Step 5: Solve for x
    x = 418,889.88/717.55
  6. Step 6: Final answer
    x = 583.78

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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.