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Finding the Fourth Proportional to 85,578.90, 128,125.35 and 80,924.10

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Solution

The fourth proportional to 85,578.90, 128,125.35 and 80,924.10 is: 121,156.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,578.90 : 128,125.35 = 80,924.10 : x
  2. Step 2: Convert to fraction form
    85,578.90/128,125.35 = 80,924.10/x
  3. Step 3: Cross multiply
    85,578.90x = 128,125.35 × 80,924.10
  4. Step 4: Simplify right side
    85,578.90x = 10,368,428,635.94
  5. Step 5: Solve for x
    x = 10,368,428,635.94/85,578.90
  6. Step 6: Final answer
    x = 121,156.37

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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.