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Finding the Fourth Proportional to 72,693.40, 109,040.10 and 61,288.60

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Solution

The fourth proportional to 72,693.40, 109,040.10 and 61,288.60 is: 91,932.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,693.40 : 109,040.10 = 61,288.60 : x
  2. Step 2: Convert to fraction form
    72,693.40/109,040.10 = 61,288.60/x
  3. Step 3: Cross multiply
    72,693.40x = 109,040.10 × 61,288.60
  4. Step 4: Simplify right side
    72,693.40x = 6,682,915,072.86
  5. Step 5: Solve for x
    x = 6,682,915,072.86/72,693.40
  6. Step 6: Final answer
    x = 91,932.90

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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.