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Finding the Fourth Proportional to 128,763.60, 193,145.40 and 84,416.10

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Solution

The fourth proportional to 128,763.60, 193,145.40 and 84,416.10 is: 126,624.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,763.60 : 193,145.40 = 84,416.10 : x
  2. Step 2: Convert to fraction form
    128,763.60/193,145.40 = 84,416.10/x
  3. Step 3: Cross multiply
    128,763.60x = 193,145.40 × 84,416.10
  4. Step 4: Simplify right side
    128,763.60x = 16,304,581,400.94
  5. Step 5: Solve for x
    x = 16,304,581,400.94/128,763.60
  6. Step 6: Final answer
    x = 126,624.15

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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.