Home / 100,206.72-138,140.64-81,311.04

Finding the Fourth Proportional to 100,206.72, 138,140.64 and 81,311.04

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Solution

The fourth proportional to 100,206.72, 138,140.64 and 81,311.04 is: 112,091.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,206.72 : 138,140.64 = 81,311.04 : x
  2. Step 2: Convert to fraction form
    100,206.72/138,140.64 = 81,311.04/x
  3. Step 3: Cross multiply
    100,206.72x = 138,140.64 × 81,311.04
  4. Step 4: Simplify right side
    100,206.72x = 11,232,359,104.67
  5. Step 5: Solve for x
    x = 11,232,359,104.67/100,206.72
  6. Step 6: Final answer
    x = 112,091.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.