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Finding the Fourth Proportional to 658.41, 987.39 and 219.59

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Solution

The fourth proportional to 658.41, 987.39 and 219.59 is: 329.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.41 : 987.39 = 219.59 : x
  2. Step 2: Convert to fraction form
    658.41/987.39 = 219.59/x
  3. Step 3: Cross multiply
    658.41x = 987.39 × 219.59
  4. Step 4: Simplify right side
    658.41x = 216,816.03
  5. Step 5: Solve for x
    x = 216,816.03/658.41
  6. Step 6: Final answer
    x = 329.30

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1.5x scale

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.