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Finding the Fourth Proportional to 86,729.80, 121,266.20 and 86,729.80

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Solution

The fourth proportional to 86,729.80, 121,266.20 and 86,729.80 is: 121,266.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,729.80 : 121,266.20 = 86,729.80 : x
  2. Step 2: Convert to fraction form
    86,729.80/121,266.20 = 86,729.80/x
  3. Step 3: Cross multiply
    86,729.80x = 121,266.20 × 86,729.80
  4. Step 4: Simplify right side
    86,729.80x = 10,517,393,272.76
  5. Step 5: Solve for x
    x = 10,517,393,272.76/86,729.80
  6. Step 6: Final answer
    x = 121,266.20

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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.