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Finding the Fourth Proportional to 949.20, 1,422.12 and 659.28

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Solution

The fourth proportional to 949.20, 1,422.12 and 659.28 is: 987.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.20 : 1,422.12 = 659.28 : x
  2. Step 2: Convert to fraction form
    949.20/1,422.12 = 659.28/x
  3. Step 3: Cross multiply
    949.20x = 1,422.12 × 659.28
  4. Step 4: Simplify right side
    949.20x = 937,575.27
  5. Step 5: Solve for x
    x = 937,575.27/949.20
  6. Step 6: Final answer
    x = 987.75

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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.