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Finding the Fourth Proportional to 717.56, 989.88 and 422.76

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Solution

The fourth proportional to 717.56, 989.88 and 422.76 is: 583.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.56 : 989.88 = 422.76 : x
  2. Step 2: Convert to fraction form
    717.56/989.88 = 422.76/x
  3. Step 3: Cross multiply
    717.56x = 989.88 × 422.76
  4. Step 4: Simplify right side
    717.56x = 418,481.67
  5. Step 5: Solve for x
    x = 418,481.67/717.56
  6. Step 6: Final answer
    x = 583.20

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Half scale
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Double scale
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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.