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Finding the Fourth Proportional to 225,718.87, 311,514.33 and 128,937.21

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Solution

The fourth proportional to 225,718.87, 311,514.33 and 128,937.21 is: 177,946.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,718.87 : 311,514.33 = 128,937.21 : x
  2. Step 2: Convert to fraction form
    225,718.87/311,514.33 = 128,937.21/x
  3. Step 3: Cross multiply
    225,718.87x = 311,514.33 × 128,937.21
  4. Step 4: Simplify right side
    225,718.87x = 40,165,788,585.22
  5. Step 5: Solve for x
    x = 40,165,788,585.22/225,718.87
  6. Step 6: Final answer
    x = 177,946.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.