Home / 81,640.10-122,460.15-81,121.70

Finding the Fourth Proportional to 81,640.10, 122,460.15 and 81,121.70

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Solution

The fourth proportional to 81,640.10, 122,460.15 and 81,121.70 is: 121,682.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,640.10 : 122,460.15 = 81,121.70 : x
  2. Step 2: Convert to fraction form
    81,640.10/122,460.15 = 81,121.70/x
  3. Step 3: Cross multiply
    81,640.10x = 122,460.15 × 81,121.70
  4. Step 4: Simplify right side
    81,640.10x = 9,934,175,550.26
  5. Step 5: Solve for x
    x = 9,934,175,550.26/81,640.10
  6. Step 6: Final answer
    x = 121,682.55

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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.