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Finding the Fourth Proportional to 717.28, 990.08 and 422.44

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Solution

The fourth proportional to 717.28, 990.08 and 422.44 is: 583.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.28 : 990.08 = 422.44 : x
  2. Step 2: Convert to fraction form
    717.28/990.08 = 422.44/x
  3. Step 3: Cross multiply
    717.28x = 990.08 × 422.44
  4. Step 4: Simplify right side
    717.28x = 418,249.40
  5. Step 5: Solve for x
    x = 418,249.40/717.28
  6. Step 6: Final answer
    x = 583.10

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1.5x scale

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.