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Finding the Fourth Proportional to 60,728.50, 91,103.13 and 20,745.28

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Solution

The fourth proportional to 60,728.50, 91,103.13 and 20,745.28 is: 31,121.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,728.50 : 91,103.13 = 20,745.28 : x
  2. Step 2: Convert to fraction form
    60,728.50/91,103.13 = 20,745.28/x
  3. Step 3: Cross multiply
    60,728.50x = 91,103.13 × 20,745.28
  4. Step 4: Simplify right side
    60,728.50x = 1,889,960,054.61
  5. Step 5: Solve for x
    x = 1,889,960,054.61/60,728.50
  6. Step 6: Final answer
    x = 31,121.47

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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.