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Finding the Fourth Proportional to 128,471.60, 192,707.40 and 78,705.20

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Solution

The fourth proportional to 128,471.60, 192,707.40 and 78,705.20 is: 118,057.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,471.60 : 192,707.40 = 78,705.20 : x
  2. Step 2: Convert to fraction form
    128,471.60/192,707.40 = 78,705.20/x
  3. Step 3: Cross multiply
    128,471.60x = 192,707.40 × 78,705.20
  4. Step 4: Simplify right side
    128,471.60x = 15,167,074,458.48
  5. Step 5: Solve for x
    x = 15,167,074,458.48/128,471.60
  6. Step 6: Final answer
    x = 118,057.80

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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.