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Finding the Fourth Proportional to 128,031.80, 192,047.70 and 115,590.20

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Solution

The fourth proportional to 128,031.80, 192,047.70 and 115,590.20 is: 173,385.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,031.80 : 192,047.70 = 115,590.20 : x
  2. Step 2: Convert to fraction form
    128,031.80/192,047.70 = 115,590.20/x
  3. Step 3: Cross multiply
    128,031.80x = 192,047.70 × 115,590.20
  4. Step 4: Simplify right side
    128,031.80x = 22,198,832,052.54
  5. Step 5: Solve for x
    x = 22,198,832,052.54/128,031.80
  6. Step 6: Final answer
    x = 173,385.30

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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.