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Finding the Fourth Proportional to 86,655, 129,982.50 and 31,251

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Solution

The fourth proportional to 86,655, 129,982.50 and 31,251 is: 46,876.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,655 : 129,982.50 = 31,251 : x
  2. Step 2: Convert to fraction form
    86,655/129,982.50 = 31,251/x
  3. Step 3: Cross multiply
    86,655x = 129,982.50 × 31,251
  4. Step 4: Simplify right side
    86,655x = 4,062,083,107.50
  5. Step 5: Solve for x
    x = 4,062,083,107.50/86,655
  6. Step 6: Final answer
    x = 46,876.50

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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.