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Finding the Fourth Proportional to 91,980.80, 137,945.28 and 39,447.44

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Solution

The fourth proportional to 91,980.80, 137,945.28 and 39,447.44 is: 59,160.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,980.80 : 137,945.28 = 39,447.44 : x
  2. Step 2: Convert to fraction form
    91,980.80/137,945.28 = 39,447.44/x
  3. Step 3: Cross multiply
    91,980.80x = 137,945.28 × 39,447.44
  4. Step 4: Simplify right side
    91,980.80x = 5,441,588,156.08
  5. Step 5: Solve for x
    x = 5,441,588,156.08/91,980.80
  6. Step 6: Final answer
    x = 59,160.04

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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.