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Finding the Fourth Proportional to 138,606.64, 206,907.30 and 121,791.58

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Solution

The fourth proportional to 138,606.64, 206,907.30 and 121,791.58 is: 181,806.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,606.64 : 206,907.30 = 121,791.58 : x
  2. Step 2: Convert to fraction form
    138,606.64/206,907.30 = 121,791.58/x
  3. Step 3: Cross multiply
    138,606.64x = 206,907.30 × 121,791.58
  4. Step 4: Simplify right side
    138,606.64x = 25,199,566,980.53
  5. Step 5: Solve for x
    x = 25,199,566,980.53/138,606.64
  6. Step 6: Final answer
    x = 181,806.35

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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.