Home / 81,069.12-120,988.80-78,969.60

Finding the Fourth Proportional to 81,069.12, 120,988.80 and 78,969.60

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Solution

The fourth proportional to 81,069.12, 120,988.80 and 78,969.60 is: 117,855.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,069.12 : 120,988.80 = 78,969.60 : x
  2. Step 2: Convert to fraction form
    81,069.12/120,988.80 = 78,969.60/x
  3. Step 3: Cross multiply
    81,069.12x = 120,988.80 × 78,969.60
  4. Step 4: Simplify right side
    81,069.12x = 9,554,437,140.48
  5. Step 5: Solve for x
    x = 9,554,437,140.48/81,069.12
  6. Step 6: Final answer
    x = 117,855.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.