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Finding the Fourth Proportional to 86,131.91, 118,862.15 and 47,891.05

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Solution

The fourth proportional to 86,131.91, 118,862.15 and 47,891.05 is: 66,089.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,131.91 : 118,862.15 = 47,891.05 : x
  2. Step 2: Convert to fraction form
    86,131.91/118,862.15 = 47,891.05/x
  3. Step 3: Cross multiply
    86,131.91x = 118,862.15 × 47,891.05
  4. Step 4: Simplify right side
    86,131.91x = 5,692,432,699.49
  5. Step 5: Solve for x
    x = 5,692,432,699.49/86,131.91
  6. Step 6: Final answer
    x = 66,089.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.