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Finding the Fourth Proportional to 91,580.91, 137,391.09 and 28,399.76

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Solution

The fourth proportional to 91,580.91, 137,391.09 and 28,399.76 is: 42,605.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,580.91 : 137,391.09 = 28,399.76 : x
  2. Step 2: Convert to fraction form
    91,580.91/137,391.09 = 28,399.76/x
  3. Step 3: Cross multiply
    91,580.91x = 137,391.09 × 28,399.76
  4. Step 4: Simplify right side
    91,580.91x = 3,901,873,295.18
  5. Step 5: Solve for x
    x = 3,901,873,295.18/91,580.91
  6. Step 6: Final answer
    x = 42,605.75

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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.