Home / 81,251.20-121,876.80-72,438.40

Finding the Fourth Proportional to 81,251.20, 121,876.80 and 72,438.40

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Solution

The fourth proportional to 81,251.20, 121,876.80 and 72,438.40 is: 108,657.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,251.20 : 121,876.80 = 72,438.40 : x
  2. Step 2: Convert to fraction form
    81,251.20/121,876.80 = 72,438.40/x
  3. Step 3: Cross multiply
    81,251.20x = 121,876.80 × 72,438.40
  4. Step 4: Simplify right side
    81,251.20x = 8,828,560,389.12
  5. Step 5: Solve for x
    x = 8,828,560,389.12/81,251.20
  6. Step 6: Final answer
    x = 108,657.60

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1.5x scale

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.