Home / 81,426.20-122,139.30-53,432.60

Finding the Fourth Proportional to 81,426.20, 122,139.30 and 53,432.60

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Solution

The fourth proportional to 81,426.20, 122,139.30 and 53,432.60 is: 80,148.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,426.20 : 122,139.30 = 53,432.60 : x
  2. Step 2: Convert to fraction form
    81,426.20/122,139.30 = 53,432.60/x
  3. Step 3: Cross multiply
    81,426.20x = 122,139.30 × 53,432.60
  4. Step 4: Simplify right side
    81,426.20x = 6,526,220,361.18
  5. Step 5: Solve for x
    x = 6,526,220,361.18/81,426.20
  6. Step 6: Final answer
    x = 80,148.90

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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.