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Finding the Fourth Proportional to 91,112.80, 136,620.60 and 38,462.80

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Solution

The fourth proportional to 91,112.80, 136,620.60 and 38,462.80 is: 57,673.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,112.80 : 136,620.60 = 38,462.80 : x
  2. Step 2: Convert to fraction form
    91,112.80/136,620.60 = 38,462.80/x
  3. Step 3: Cross multiply
    91,112.80x = 136,620.60 × 38,462.80
  4. Step 4: Simplify right side
    91,112.80x = 5,254,810,813.68
  5. Step 5: Solve for x
    x = 5,254,810,813.68/91,112.80
  6. Step 6: Final answer
    x = 57,673.68

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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.