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Finding the Fourth Proportional to 659.68, 988.84 and 220.60

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Solution

The fourth proportional to 659.68, 988.84 and 220.60 is: 330.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.68 : 988.84 = 220.60 : x
  2. Step 2: Convert to fraction form
    659.68/988.84 = 220.60/x
  3. Step 3: Cross multiply
    659.68x = 988.84 × 220.60
  4. Step 4: Simplify right side
    659.68x = 218,138.10
  5. Step 5: Solve for x
    x = 218,138.10/659.68
  6. Step 6: Final answer
    x = 330.67

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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.