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Finding the Fourth Proportional to 85,851.70, 128,623.10 and 80,787.28

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Solution

The fourth proportional to 85,851.70, 128,623.10 and 80,787.28 is: 121,035.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,851.70 : 128,623.10 = 80,787.28 : x
  2. Step 2: Convert to fraction form
    85,851.70/128,623.10 = 80,787.28/x
  3. Step 3: Cross multiply
    85,851.70x = 128,623.10 × 80,787.28
  4. Step 4: Simplify right side
    85,851.70x = 10,391,109,668.67
  5. Step 5: Solve for x
    x = 10,391,109,668.67/85,851.70
  6. Step 6: Final answer
    x = 121,035.57

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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.