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Finding the Fourth Proportional to 86,640.35, 129,927.71 and 34,021.13

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Solution

The fourth proportional to 86,640.35, 129,927.71 and 34,021.13 is: 51,018.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,640.35 : 129,927.71 = 34,021.13 : x
  2. Step 2: Convert to fraction form
    86,640.35/129,927.71 = 34,021.13/x
  3. Step 3: Cross multiply
    86,640.35x = 129,927.71 × 34,021.13
  4. Step 4: Simplify right side
    86,640.35x = 4,420,286,947.93
  5. Step 5: Solve for x
    x = 4,420,286,947.93/86,640.35
  6. Step 6: Final answer
    x = 51,018.81

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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.