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Finding the Fourth Proportional to 659.47, 989.23 and 220.76

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Solution

The fourth proportional to 659.47, 989.23 and 220.76 is: 331.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.47 : 989.23 = 220.76 : x
  2. Step 2: Convert to fraction form
    659.47/989.23 = 220.76/x
  3. Step 3: Cross multiply
    659.47x = 989.23 × 220.76
  4. Step 4: Simplify right side
    659.47x = 218,377.47
  5. Step 5: Solve for x
    x = 218,377.47/659.47
  6. Step 6: Final answer
    x = 331.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.