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Finding the Fourth Proportional to 78,619.20, 117,928.80 and 70,843.20

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Solution

The fourth proportional to 78,619.20, 117,928.80 and 70,843.20 is: 106,264.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,619.20 : 117,928.80 = 70,843.20 : x
  2. Step 2: Convert to fraction form
    78,619.20/117,928.80 = 70,843.20/x
  3. Step 3: Cross multiply
    78,619.20x = 117,928.80 × 70,843.20
  4. Step 4: Simplify right side
    78,619.20x = 8,354,453,564.16
  5. Step 5: Solve for x
    x = 8,354,453,564.16/78,619.20
  6. Step 6: Final answer
    x = 106,264.80

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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.