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Finding the Fourth Proportional to 139,637.70, 209,456.55 and 136,357.20

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Solution

The fourth proportional to 139,637.70, 209,456.55 and 136,357.20 is: 204,535.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,637.70 : 209,456.55 = 136,357.20 : x
  2. Step 2: Convert to fraction form
    139,637.70/209,456.55 = 136,357.20/x
  3. Step 3: Cross multiply
    139,637.70x = 209,456.55 × 136,357.20
  4. Step 4: Simplify right side
    139,637.70x = 28,560,908,679.66
  5. Step 5: Solve for x
    x = 28,560,908,679.66/139,637.70
  6. Step 6: Final answer
    x = 204,535.80

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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.