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Finding the Fourth Proportional to 85,856.49, 128,806.61 and 26,692.65

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Solution

The fourth proportional to 85,856.49, 128,806.61 and 26,692.65 is: 40,045.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,856.49 : 128,806.61 = 26,692.65 : x
  2. Step 2: Convert to fraction form
    85,856.49/128,806.61 = 26,692.65/x
  3. Step 3: Cross multiply
    85,856.49x = 128,806.61 × 26,692.65
  4. Step 4: Simplify right side
    85,856.49x = 3,438,189,624.95
  5. Step 5: Solve for x
    x = 3,438,189,624.95/85,856.49
  6. Step 6: Final answer
    x = 40,045.77

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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.