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Finding the Fourth Proportional to 86,645.48, 129,972.83 and 27,485.78

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Solution

The fourth proportional to 86,645.48, 129,972.83 and 27,485.78 is: 41,230.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,645.48 : 129,972.83 = 27,485.78 : x
  2. Step 2: Convert to fraction form
    86,645.48/129,972.83 = 27,485.78/x
  3. Step 3: Cross multiply
    86,645.48x = 129,972.83 × 27,485.78
  4. Step 4: Simplify right side
    86,645.48x = 3,572,403,824.06
  5. Step 5: Solve for x
    x = 3,572,403,824.06/86,645.48
  6. Step 6: Final answer
    x = 41,230.13

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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.