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Finding the Fourth Proportional to 85,692.20, 128,480.70 and 45,717.80

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Solution

The fourth proportional to 85,692.20, 128,480.70 and 45,717.80 is: 68,545.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,692.20 : 128,480.70 = 45,717.80 : x
  2. Step 2: Convert to fraction form
    85,692.20/128,480.70 = 45,717.80/x
  3. Step 3: Cross multiply
    85,692.20x = 128,480.70 × 45,717.80
  4. Step 4: Simplify right side
    85,692.20x = 5,873,854,946.46
  5. Step 5: Solve for x
    x = 5,873,854,946.46/85,692.20
  6. Step 6: Final answer
    x = 68,545.97

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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.