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Finding the Fourth Proportional to 85,979.80, 128,969.70 and 22,799.80

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Solution

The fourth proportional to 85,979.80, 128,969.70 and 22,799.80 is: 34,199.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,979.80 : 128,969.70 = 22,799.80 : x
  2. Step 2: Convert to fraction form
    85,979.80/128,969.70 = 22,799.80/x
  3. Step 3: Cross multiply
    85,979.80x = 128,969.70 × 22,799.80
  4. Step 4: Simplify right side
    85,979.80x = 2,940,483,366.06
  5. Step 5: Solve for x
    x = 2,940,483,366.06/85,979.80
  6. Step 6: Final answer
    x = 34,199.70

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Similar ratio
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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.