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Finding the Fourth Proportional to 128,363.38, 192,590.69 and 57,279.56

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Solution

The fourth proportional to 128,363.38, 192,590.69 and 57,279.56 is: 85,939.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,363.38 : 192,590.69 = 57,279.56 : x
  2. Step 2: Convert to fraction form
    128,363.38/192,590.69 = 57,279.56/x
  3. Step 3: Cross multiply
    128,363.38x = 192,590.69 × 57,279.56
  4. Step 4: Simplify right side
    128,363.38x = 11,031,508,895.04
  5. Step 5: Solve for x
    x = 11,031,508,895.04/128,363.38
  6. Step 6: Final answer
    x = 85,939.69

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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.