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Finding the Fourth Proportional to 128,279.20, 192,418.80 and 34,784.80

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Solution

The fourth proportional to 128,279.20, 192,418.80 and 34,784.80 is: 52,177.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,279.20 : 192,418.80 = 34,784.80 : x
  2. Step 2: Convert to fraction form
    128,279.20/192,418.80 = 34,784.80/x
  3. Step 3: Cross multiply
    128,279.20x = 192,418.80 × 34,784.80
  4. Step 4: Simplify right side
    128,279.20x = 6,693,249,474.24
  5. Step 5: Solve for x
    x = 6,693,249,474.24/128,279.20
  6. Step 6: Final answer
    x = 52,177.20

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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.