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Finding the Fourth Proportional to 86,629.88, 129,867.06 and 31,187

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Solution

The fourth proportional to 86,629.88, 129,867.06 and 31,187 is: 46,752.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,629.88 : 129,867.06 = 31,187 : x
  2. Step 2: Convert to fraction form
    86,629.88/129,867.06 = 31,187/x
  3. Step 3: Cross multiply
    86,629.88x = 129,867.06 × 31,187
  4. Step 4: Simplify right side
    86,629.88x = 4,050,164,000.22
  5. Step 5: Solve for x
    x = 4,050,164,000.22/86,629.88
  6. Step 6: Final answer
    x = 46,752.51

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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.