Home / 81,947.10-122,920.65-80,780.70

Finding the Fourth Proportional to 81,947.10, 122,920.65 and 80,780.70

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Solution

The fourth proportional to 81,947.10, 122,920.65 and 80,780.70 is: 121,171.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,947.10 : 122,920.65 = 80,780.70 : x
  2. Step 2: Convert to fraction form
    81,947.10/122,920.65 = 80,780.70/x
  3. Step 3: Cross multiply
    81,947.10x = 122,920.65 × 80,780.70
  4. Step 4: Simplify right side
    81,947.10x = 9,929,616,151.46
  5. Step 5: Solve for x
    x = 9,929,616,151.46/81,947.10
  6. Step 6: Final answer
    x = 121,171.05

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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.