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Finding the Fourth Proportional to 86,731.80, 121,269 and 86,731.80

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Solution

The fourth proportional to 86,731.80, 121,269 and 86,731.80 is: 121,269

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,731.80 : 121,269 = 86,731.80 : x
  2. Step 2: Convert to fraction form
    86,731.80/121,269 = 86,731.80/x
  3. Step 3: Cross multiply
    86,731.80x = 121,269 × 86,731.80
  4. Step 4: Simplify right side
    86,731.80x = 10,517,878,654.20
  5. Step 5: Solve for x
    x = 10,517,878,654.20/86,731.80
  6. Step 6: Final answer
    x = 121,269

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.