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Finding the Fourth Proportional to 427,959.20, 641,695.80 and 161,728.40

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Solution

The fourth proportional to 427,959.20, 641,695.80 and 161,728.40 is: 242,500.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,959.20 : 641,695.80 = 161,728.40 : x
  2. Step 2: Convert to fraction form
    427,959.20/641,695.80 = 161,728.40/x
  3. Step 3: Cross multiply
    427,959.20x = 641,695.80 × 161,728.40
  4. Step 4: Simplify right side
    427,959.20x = 103,780,435,020.72
  5. Step 5: Solve for x
    x = 103,780,435,020.72/427,959.20
  6. Step 6: Final answer
    x = 242,500.77

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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.