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Finding the Fourth Proportional to 128,663.20, 192,994.80 and 121,446.10

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Solution

The fourth proportional to 128,663.20, 192,994.80 and 121,446.10 is: 182,169.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,663.20 : 192,994.80 = 121,446.10 : x
  2. Step 2: Convert to fraction form
    128,663.20/192,994.80 = 121,446.10/x
  3. Step 3: Cross multiply
    128,663.20x = 192,994.80 × 121,446.10
  4. Step 4: Simplify right side
    128,663.20x = 23,438,465,780.28
  5. Step 5: Solve for x
    x = 23,438,465,780.28/128,663.20
  6. Step 6: Final answer
    x = 182,169.15

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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.