Home / 138,630.90-206,943.42-121,815.84

Finding the Fourth Proportional to 138,630.90, 206,943.42 and 121,815.84

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Solution

The fourth proportional to 138,630.90, 206,943.42 and 121,815.84 is: 181,842.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,630.90 : 206,943.42 = 121,815.84 : x
  2. Step 2: Convert to fraction form
    138,630.90/206,943.42 = 121,815.84/x
  3. Step 3: Cross multiply
    138,630.90x = 206,943.42 × 121,815.84
  4. Step 4: Simplify right side
    138,630.90x = 25,208,986,539.77
  5. Step 5: Solve for x
    x = 25,208,986,539.77/138,630.90
  6. Step 6: Final answer
    x = 181,842.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.