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Finding the Fourth Proportional to 138,603.90, 206,903.22 and 121,788.78

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Solution

The fourth proportional to 138,603.90, 206,903.22 and 121,788.78 is: 181,802.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,603.90 : 206,903.22 = 121,788.78 : x
  2. Step 2: Convert to fraction form
    138,603.90/206,903.22 = 121,788.78/x
  3. Step 3: Cross multiply
    138,603.90x = 206,903.22 × 121,788.78
  4. Step 4: Simplify right side
    138,603.90x = 25,198,490,741.87
  5. Step 5: Solve for x
    x = 25,198,490,741.87/138,603.90
  6. Step 6: Final answer
    x = 181,802.18

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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.