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Finding the Fourth Proportional to 128,915.20, 193,219.20 and 54,035.20

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Solution

The fourth proportional to 128,915.20, 193,219.20 and 54,035.20 is: 80,988.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,915.20 : 193,219.20 = 54,035.20 : x
  2. Step 2: Convert to fraction form
    128,915.20/193,219.20 = 54,035.20/x
  3. Step 3: Cross multiply
    128,915.20x = 193,219.20 × 54,035.20
  4. Step 4: Simplify right side
    128,915.20x = 10,440,638,115.84
  5. Step 5: Solve for x
    x = 10,440,638,115.84/128,915.20
  6. Step 6: Final answer
    x = 80,988.42

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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.