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Finding the Fourth Proportional to 81,207.40, 121,806.78 and 25,799.08

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Solution

The fourth proportional to 81,207.40, 121,806.78 and 25,799.08 is: 38,697.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,207.40 : 121,806.78 = 25,799.08 : x
  2. Step 2: Convert to fraction form
    81,207.40/121,806.78 = 25,799.08/x
  3. Step 3: Cross multiply
    81,207.40x = 121,806.78 × 25,799.08
  4. Step 4: Simplify right side
    81,207.40x = 3,142,502,861.76
  5. Step 5: Solve for x
    x = 3,142,502,861.76/81,207.40
  6. Step 6: Final answer
    x = 38,697.25

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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.