Home / 82,390.40-123,585.60-78,891.20

Finding the Fourth Proportional to 82,390.40, 123,585.60 and 78,891.20

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Solution

The fourth proportional to 82,390.40, 123,585.60 and 78,891.20 is: 118,336.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,390.40 : 123,585.60 = 78,891.20 : x
  2. Step 2: Convert to fraction form
    82,390.40/123,585.60 = 78,891.20/x
  3. Step 3: Cross multiply
    82,390.40x = 123,585.60 × 78,891.20
  4. Step 4: Simplify right side
    82,390.40x = 9,749,816,286.72
  5. Step 5: Solve for x
    x = 9,749,816,286.72/82,390.40
  6. Step 6: Final answer
    x = 118,336.80

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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.