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Finding the Fourth Proportional to 659.98, 990.11 and 197.80

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Solution

The fourth proportional to 659.98, 990.11 and 197.80 is: 296.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.98 : 990.11 = 197.80 : x
  2. Step 2: Convert to fraction form
    659.98/990.11 = 197.80/x
  3. Step 3: Cross multiply
    659.98x = 990.11 × 197.80
  4. Step 4: Simplify right side
    659.98x = 195,841.78
  5. Step 5: Solve for x
    x = 195,841.78/659.98
  6. Step 6: Final answer
    x = 296.74

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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.