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Finding the Fourth Proportional to 659.15, 988.61 and 248.21

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Solution

The fourth proportional to 659.15, 988.61 and 248.21 is: 372.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.15 : 988.61 = 248.21 : x
  2. Step 2: Convert to fraction form
    659.15/988.61 = 248.21/x
  3. Step 3: Cross multiply
    659.15x = 988.61 × 248.21
  4. Step 4: Simplify right side
    659.15x = 245,385.97
  5. Step 5: Solve for x
    x = 245,385.97/659.15
  6. Step 6: Final answer
    x = 372.28

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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.