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Finding the Fourth Proportional to 205,872.80, 308,809.20 and 87,514.40

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Solution

The fourth proportional to 205,872.80, 308,809.20 and 87,514.40 is: 131,271.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,872.80 : 308,809.20 = 87,514.40 : x
  2. Step 2: Convert to fraction form
    205,872.80/308,809.20 = 87,514.40/x
  3. Step 3: Cross multiply
    205,872.80x = 308,809.20 × 87,514.40
  4. Step 4: Simplify right side
    205,872.80x = 27,025,251,852.48
  5. Step 5: Solve for x
    x = 27,025,251,852.48/205,872.80
  6. Step 6: Final answer
    x = 131,271.60

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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.