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Finding the Fourth Proportional to 81,116.13, 121,674.20 and 25,712.13

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Solution

The fourth proportional to 81,116.13, 121,674.20 and 25,712.13 is: 38,568.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,116.13 : 121,674.20 = 25,712.13 : x
  2. Step 2: Convert to fraction form
    81,116.13/121,674.20 = 25,712.13/x
  3. Step 3: Cross multiply
    81,116.13x = 121,674.20 × 25,712.13
  4. Step 4: Simplify right side
    81,116.13x = 3,128,502,848.05
  5. Step 5: Solve for x
    x = 3,128,502,848.05/81,116.13
  6. Step 6: Final answer
    x = 38,568.20

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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.