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Finding the Fourth Proportional to 86,640.54, 129,965.43 and 27,480.77

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Solution

The fourth proportional to 86,640.54, 129,965.43 and 27,480.77 is: 41,222.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,640.54 : 129,965.43 = 27,480.77 : x
  2. Step 2: Convert to fraction form
    86,640.54/129,965.43 = 27,480.77/x
  3. Step 3: Cross multiply
    86,640.54x = 129,965.43 × 27,480.77
  4. Step 4: Simplify right side
    86,640.54x = 3,571,549,875.80
  5. Step 5: Solve for x
    x = 3,571,549,875.80/86,640.54
  6. Step 6: Final answer
    x = 41,222.62

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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.