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Finding the Fourth Proportional to 128,005.80, 192,008.70 and 112,972.20

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Solution

The fourth proportional to 128,005.80, 192,008.70 and 112,972.20 is: 169,458.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,005.80 : 192,008.70 = 112,972.20 : x
  2. Step 2: Convert to fraction form
    128,005.80/192,008.70 = 112,972.20/x
  3. Step 3: Cross multiply
    128,005.80x = 192,008.70 × 112,972.20
  4. Step 4: Simplify right side
    128,005.80x = 21,691,645,258.14
  5. Step 5: Solve for x
    x = 21,691,645,258.14/128,005.80
  6. Step 6: Final answer
    x = 169,458.30

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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.