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Finding the Fourth Proportional to 659.60, 989.55 and 197.42

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Solution

The fourth proportional to 659.60, 989.55 and 197.42 is: 296.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.60 : 989.55 = 197.42 : x
  2. Step 2: Convert to fraction form
    659.60/989.55 = 197.42/x
  3. Step 3: Cross multiply
    659.60x = 989.55 × 197.42
  4. Step 4: Simplify right side
    659.60x = 195,359.43
  5. Step 5: Solve for x
    x = 195,359.43/659.60
  6. Step 6: Final answer
    x = 296.18

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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.