Home / 100,103.60-138,082.92-66,112.16

Finding the Fourth Proportional to 100,103.60, 138,082.92 and 66,112.16

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Solution

The fourth proportional to 100,103.60, 138,082.92 and 66,112.16 is: 91,195.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,103.60 : 138,082.92 = 66,112.16 : x
  2. Step 2: Convert to fraction form
    100,103.60/138,082.92 = 66,112.16/x
  3. Step 3: Cross multiply
    100,103.60x = 138,082.92 × 66,112.16
  4. Step 4: Simplify right side
    100,103.60x = 9,128,960,100.31
  5. Step 5: Solve for x
    x = 9,128,960,100.31/100,103.60
  6. Step 6: Final answer
    x = 91,195.12

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1.5x scale

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.