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Finding the Fourth Proportional to 139,915.20, 209,872.80 and 100,840.80

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Solution

The fourth proportional to 139,915.20, 209,872.80 and 100,840.80 is: 151,261.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,915.20 : 209,872.80 = 100,840.80 : x
  2. Step 2: Convert to fraction form
    139,915.20/209,872.80 = 100,840.80/x
  3. Step 3: Cross multiply
    139,915.20x = 209,872.80 × 100,840.80
  4. Step 4: Simplify right side
    139,915.20x = 21,163,741,050.24
  5. Step 5: Solve for x
    x = 21,163,741,050.24/139,915.20
  6. Step 6: Final answer
    x = 151,261.20

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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.