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Finding the Fourth Proportional to 128,959.56, 193,440.42 and 40,209.48

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Solution

The fourth proportional to 128,959.56, 193,440.42 and 40,209.48 is: 60,314.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,959.56 : 193,440.42 = 40,209.48 : x
  2. Step 2: Convert to fraction form
    128,959.56/193,440.42 = 40,209.48/x
  3. Step 3: Cross multiply
    128,959.56x = 193,440.42 × 40,209.48
  4. Step 4: Simplify right side
    128,959.56x = 7,778,138,699.18
  5. Step 5: Solve for x
    x = 7,778,138,699.18/128,959.56
  6. Step 6: Final answer
    x = 60,314.56

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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.