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Finding the Fourth Proportional to 128,053.20, 192,252.60 and 81,397.20

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Solution

The fourth proportional to 128,053.20, 192,252.60 and 81,397.20 is: 122,205.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,053.20 : 192,252.60 = 81,397.20 : x
  2. Step 2: Convert to fraction form
    128,053.20/192,252.60 = 81,397.20/x
  3. Step 3: Cross multiply
    128,053.20x = 192,252.60 × 81,397.20
  4. Step 4: Simplify right side
    128,053.20x = 15,648,823,332.72
  5. Step 5: Solve for x
    x = 15,648,823,332.72/128,053.20
  6. Step 6: Final answer
    x = 122,205.64

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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.