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Finding the Fourth Proportional to 139,915.20, 209,872.80 and 136,999.20

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Solution

The fourth proportional to 139,915.20, 209,872.80 and 136,999.20 is: 205,498.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,915.20 : 209,872.80 = 136,999.20 : x
  2. Step 2: Convert to fraction form
    139,915.20/209,872.80 = 136,999.20/x
  3. Step 3: Cross multiply
    139,915.20x = 209,872.80 × 136,999.20
  4. Step 4: Simplify right side
    139,915.20x = 28,752,405,701.76
  5. Step 5: Solve for x
    x = 28,752,405,701.76/139,915.20
  6. Step 6: Final answer
    x = 205,498.80

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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.