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Finding the Fourth Proportional to 76,987.20, 115,480.80 and 66,619.20

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Solution

The fourth proportional to 76,987.20, 115,480.80 and 66,619.20 is: 99,928.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,987.20 : 115,480.80 = 66,619.20 : x
  2. Step 2: Convert to fraction form
    76,987.20/115,480.80 = 66,619.20/x
  3. Step 3: Cross multiply
    76,987.20x = 115,480.80 × 66,619.20
  4. Step 4: Simplify right side
    76,987.20x = 7,693,238,511.36
  5. Step 5: Solve for x
    x = 7,693,238,511.36/76,987.20
  6. Step 6: Final answer
    x = 99,928.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.