Home / 78,106.28-117,135.20-28,179.90

Finding the Fourth Proportional to 78,106.28, 117,135.20 and 28,179.90

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Solution

The fourth proportional to 78,106.28, 117,135.20 and 28,179.90 is: 42,261.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,106.28 : 117,135.20 = 28,179.90 : x
  2. Step 2: Convert to fraction form
    78,106.28/117,135.20 = 28,179.90/x
  3. Step 3: Cross multiply
    78,106.28x = 117,135.20 × 28,179.90
  4. Step 4: Simplify right side
    78,106.28x = 3,300,858,222.48
  5. Step 5: Solve for x
    x = 3,300,858,222.48/78,106.28
  6. Step 6: Final answer
    x = 42,261.11

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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.