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Finding the Fourth Proportional to 431,661.20, 647,540.40 and 132,139.40

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Solution

The fourth proportional to 431,661.20, 647,540.40 and 132,139.40 is: 198,223.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,661.20 : 647,540.40 = 132,139.40 : x
  2. Step 2: Convert to fraction form
    431,661.20/647,540.40 = 132,139.40/x
  3. Step 3: Cross multiply
    431,661.20x = 647,540.40 × 132,139.40
  4. Step 4: Simplify right side
    431,661.20x = 85,565,599,931.76
  5. Step 5: Solve for x
    x = 85,565,599,931.76/431,661.20
  6. Step 6: Final answer
    x = 198,223.98

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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.