Home / 81,405.10-122,107.65-80,886.70

Finding the Fourth Proportional to 81,405.10, 122,107.65 and 80,886.70

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Solution

The fourth proportional to 81,405.10, 122,107.65 and 80,886.70 is: 121,330.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,405.10 : 122,107.65 = 80,886.70 : x
  2. Step 2: Convert to fraction form
    81,405.10/122,107.65 = 80,886.70/x
  3. Step 3: Cross multiply
    81,405.10x = 122,107.65 × 80,886.70
  4. Step 4: Simplify right side
    81,405.10x = 9,876,884,853.26
  5. Step 5: Solve for x
    x = 9,876,884,853.26/81,405.10
  6. Step 6: Final answer
    x = 121,330.05

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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.