Home / 100,209.72-138,144.78-81,314.04

Finding the Fourth Proportional to 100,209.72, 138,144.78 and 81,314.04

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Solution

The fourth proportional to 100,209.72, 138,144.78 and 81,314.04 is: 112,096.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,209.72 : 138,144.78 = 81,314.04 : x
  2. Step 2: Convert to fraction form
    100,209.72/138,144.78 = 81,314.04/x
  3. Step 3: Cross multiply
    100,209.72x = 138,144.78 × 81,314.04
  4. Step 4: Simplify right side
    100,209.72x = 11,233,110,166.71
  5. Step 5: Solve for x
    x = 11,233,110,166.71/100,209.72
  6. Step 6: Final answer
    x = 112,096.01

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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.