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Finding the Fourth Proportional to 696.16, 958.80 and 521.20

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Solution

The fourth proportional to 696.16, 958.80 and 521.20 is: 717.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.16 : 958.80 = 521.20 : x
  2. Step 2: Convert to fraction form
    696.16/958.80 = 521.20/x
  3. Step 3: Cross multiply
    696.16x = 958.80 × 521.20
  4. Step 4: Simplify right side
    696.16x = 499,726.56
  5. Step 5: Solve for x
    x = 499,726.56/696.16
  6. Step 6: Final answer
    x = 717.83

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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.