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Finding the Fourth Proportional to 128,026.80, 192,040.20 and 81,332.40

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Solution

The fourth proportional to 128,026.80, 192,040.20 and 81,332.40 is: 121,998.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,026.80 : 192,040.20 = 81,332.40 : x
  2. Step 2: Convert to fraction form
    128,026.80/192,040.20 = 81,332.40/x
  3. Step 3: Cross multiply
    128,026.80x = 192,040.20 × 81,332.40
  4. Step 4: Simplify right side
    128,026.80x = 15,619,090,362.48
  5. Step 5: Solve for x
    x = 15,619,090,362.48/128,026.80
  6. Step 6: Final answer
    x = 121,998.60

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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.