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Finding the Fourth Proportional to 85,672.51, 128,545.52 and 33,118.90

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Solution

The fourth proportional to 85,672.51, 128,545.52 and 33,118.90 is: 49,692.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,672.51 : 128,545.52 = 33,118.90 : x
  2. Step 2: Convert to fraction form
    85,672.51/128,545.52 = 33,118.90/x
  3. Step 3: Cross multiply
    85,672.51x = 128,545.52 × 33,118.90
  4. Step 4: Simplify right side
    85,672.51x = 4,257,285,735.37
  5. Step 5: Solve for x
    x = 4,257,285,735.37/85,672.51
  6. Step 6: Final answer
    x = 49,692.55

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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.