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Finding the Fourth Proportional to 91,418.80, 137,128.20 and 72,986.80

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Solution

The fourth proportional to 91,418.80, 137,128.20 and 72,986.80 is: 109,480.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,418.80 : 137,128.20 = 72,986.80 : x
  2. Step 2: Convert to fraction form
    91,418.80/137,128.20 = 72,986.80/x
  3. Step 3: Cross multiply
    91,418.80x = 137,128.20 × 72,986.80
  4. Step 4: Simplify right side
    91,418.80x = 10,008,548,507.76
  5. Step 5: Solve for x
    x = 10,008,548,507.76/91,418.80
  6. Step 6: Final answer
    x = 109,480.20

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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.