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Finding the Fourth Proportional to 91,786.40, 137,720.90 and 49,617.10

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Solution

The fourth proportional to 91,786.40, 137,720.90 and 49,617.10 is: 74,447.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,786.40 : 137,720.90 = 49,617.10 : x
  2. Step 2: Convert to fraction form
    91,786.40/137,720.90 = 49,617.10/x
  3. Step 3: Cross multiply
    91,786.40x = 137,720.90 × 49,617.10
  4. Step 4: Simplify right side
    91,786.40x = 6,833,311,667.39
  5. Step 5: Solve for x
    x = 6,833,311,667.39/91,786.40
  6. Step 6: Final answer
    x = 74,447.98

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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.