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Finding the Fourth Proportional to 86,940.90, 121,979.70 and 86,940.90

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Solution

The fourth proportional to 86,940.90, 121,979.70 and 86,940.90 is: 121,979.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,940.90 : 121,979.70 = 86,940.90 : x
  2. Step 2: Convert to fraction form
    86,940.90/121,979.70 = 86,940.90/x
  3. Step 3: Cross multiply
    86,940.90x = 121,979.70 × 86,940.90
  4. Step 4: Simplify right side
    86,940.90x = 10,605,024,899.73
  5. Step 5: Solve for x
    x = 10,605,024,899.73/86,940.90
  6. Step 6: Final answer
    x = 121,979.70

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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.