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Finding the Fourth Proportional to 128,390.40, 192,585.60 and 115,300.80

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Solution

The fourth proportional to 128,390.40, 192,585.60 and 115,300.80 is: 172,951.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,390.40 : 192,585.60 = 115,300.80 : x
  2. Step 2: Convert to fraction form
    128,390.40/192,585.60 = 115,300.80/x
  3. Step 3: Cross multiply
    128,390.40x = 192,585.60 × 115,300.80
  4. Step 4: Simplify right side
    128,390.40x = 22,205,273,748.48
  5. Step 5: Solve for x
    x = 22,205,273,748.48/128,390.40
  6. Step 6: Final answer
    x = 172,951.20

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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.