Home / 128,470.31-192,705.50-39,721.85

Finding the Fourth Proportional to 128,470.31, 192,705.50 and 39,721.85

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Solution

The fourth proportional to 128,470.31, 192,705.50 and 39,721.85 is: 59,582.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,470.31 : 192,705.50 = 39,721.85 : x
  2. Step 2: Convert to fraction form
    128,470.31/192,705.50 = 39,721.85/x
  3. Step 3: Cross multiply
    128,470.31x = 192,705.50 × 39,721.85
  4. Step 4: Simplify right side
    128,470.31x = 7,654,618,965.18
  5. Step 5: Solve for x
    x = 7,654,618,965.18/128,470.31
  6. Step 6: Final answer
    x = 59,582.79

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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.