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Finding the Fourth Proportional to 128,031.57, 192,085.79 and 60,615

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Solution

The fourth proportional to 128,031.57, 192,085.79 and 60,615 is: 90,940.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,031.57 : 192,085.79 = 60,615 : x
  2. Step 2: Convert to fraction form
    128,031.57/192,085.79 = 60,615/x
  3. Step 3: Cross multiply
    128,031.57x = 192,085.79 × 60,615
  4. Step 4: Simplify right side
    128,031.57x = 11,643,279,857.78
  5. Step 5: Solve for x
    x = 11,643,279,857.78/128,031.57
  6. Step 6: Final answer
    x = 90,940.69

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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.