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Finding the Fourth Proportional to 128,446.60, 192,669.90 and 78,680.20

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Solution

The fourth proportional to 128,446.60, 192,669.90 and 78,680.20 is: 118,020.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,446.60 : 192,669.90 = 78,680.20 : x
  2. Step 2: Convert to fraction form
    128,446.60/192,669.90 = 78,680.20/x
  3. Step 3: Cross multiply
    128,446.60x = 192,669.90 × 78,680.20
  4. Step 4: Simplify right side
    128,446.60x = 15,159,306,265.98
  5. Step 5: Solve for x
    x = 15,159,306,265.98/128,446.60
  6. Step 6: Final answer
    x = 118,020.30

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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.