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Finding the Fourth Proportional to 128,085.60, 192,157.20 and 39,343.20

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Solution

The fourth proportional to 128,085.60, 192,157.20 and 39,343.20 is: 59,023.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,085.60 : 192,157.20 = 39,343.20 : x
  2. Step 2: Convert to fraction form
    128,085.60/192,157.20 = 39,343.20/x
  3. Step 3: Cross multiply
    128,085.60x = 192,157.20 × 39,343.20
  4. Step 4: Simplify right side
    128,085.60x = 7,560,079,151.04
  5. Step 5: Solve for x
    x = 7,560,079,151.04/128,085.60
  6. Step 6: Final answer
    x = 59,023.65

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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.