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Finding the Fourth Proportional to 205,139.40, 307,881.90 and 80,569.80

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Solution

The fourth proportional to 205,139.40, 307,881.90 and 80,569.80 is: 120,922.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,139.40 : 307,881.90 = 80,569.80 : x
  2. Step 2: Convert to fraction form
    205,139.40/307,881.90 = 80,569.80/x
  3. Step 3: Cross multiply
    205,139.40x = 307,881.90 × 80,569.80
  4. Step 4: Simplify right side
    205,139.40x = 24,805,983,106.62
  5. Step 5: Solve for x
    x = 24,805,983,106.62/205,139.40
  6. Step 6: Final answer
    x = 120,922.57

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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.