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Finding the Fourth Proportional to 659.12, 988.58 and 220.38

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Solution

The fourth proportional to 659.12, 988.58 and 220.38 is: 330.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.12 : 988.58 = 220.38 : x
  2. Step 2: Convert to fraction form
    659.12/988.58 = 220.38/x
  3. Step 3: Cross multiply
    659.12x = 988.58 × 220.38
  4. Step 4: Simplify right side
    659.12x = 217,863.26
  5. Step 5: Solve for x
    x = 217,863.26/659.12
  6. Step 6: Final answer
    x = 330.54

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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.