Home / 80,935.20-121,431.60-78,055.20

Finding the Fourth Proportional to 80,935.20, 121,431.60 and 78,055.20

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Solution

The fourth proportional to 80,935.20, 121,431.60 and 78,055.20 is: 117,110.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,935.20 : 121,431.60 = 78,055.20 : x
  2. Step 2: Convert to fraction form
    80,935.20/121,431.60 = 78,055.20/x
  3. Step 3: Cross multiply
    80,935.20x = 121,431.60 × 78,055.20
  4. Step 4: Simplify right side
    80,935.20x = 9,478,367,824.32
  5. Step 5: Solve for x
    x = 9,478,367,824.32/80,935.20
  6. Step 6: Final answer
    x = 117,110.58

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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.