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Finding the Fourth Proportional to 223,917.80, 309,034.82 and 128,422.45

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Solution

The fourth proportional to 223,917.80, 309,034.82 and 128,422.45 is: 177,239.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,917.80 : 309,034.82 = 128,422.45 : x
  2. Step 2: Convert to fraction form
    223,917.80/309,034.82 = 128,422.45/x
  3. Step 3: Cross multiply
    223,917.80x = 309,034.82 × 128,422.45
  4. Step 4: Simplify right side
    223,917.80x = 39,687,006,532.42
  5. Step 5: Solve for x
    x = 39,687,006,532.42/223,917.80
  6. Step 6: Final answer
    x = 177,239.18

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1.5x scale

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.