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Finding the Fourth Proportional to 107,915.20, 161,872.80 and 104,286.40

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Solution

The fourth proportional to 107,915.20, 161,872.80 and 104,286.40 is: 156,429.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,915.20 : 161,872.80 = 104,286.40 : x
  2. Step 2: Convert to fraction form
    107,915.20/161,872.80 = 104,286.40/x
  3. Step 3: Cross multiply
    107,915.20x = 161,872.80 × 104,286.40
  4. Step 4: Simplify right side
    107,915.20x = 16,881,131,569.92
  5. Step 5: Solve for x
    x = 16,881,131,569.92/107,915.20
  6. Step 6: Final answer
    x = 156,429.60

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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.