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Finding the Fourth Proportional to 82,390.80, 123,845.40 and 80,835.60

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Solution

The fourth proportional to 82,390.80, 123,845.40 and 80,835.60 is: 121,507.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,390.80 : 123,845.40 = 80,835.60 : x
  2. Step 2: Convert to fraction form
    82,390.80/123,845.40 = 80,835.60/x
  3. Step 3: Cross multiply
    82,390.80x = 123,845.40 × 80,835.60
  4. Step 4: Simplify right side
    82,390.80x = 10,011,117,216.24
  5. Step 5: Solve for x
    x = 10,011,117,216.24/82,390.80
  6. Step 6: Final answer
    x = 121,507.71

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1.5x scale

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.