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Finding the Fourth Proportional to 60,865.20, 91,307.52 and 20,879.64

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Solution

The fourth proportional to 60,865.20, 91,307.52 and 20,879.64 is: 31,322.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,865.20 : 91,307.52 = 20,879.64 : x
  2. Step 2: Convert to fraction form
    60,865.20/91,307.52 = 20,879.64/x
  3. Step 3: Cross multiply
    60,865.20x = 91,307.52 × 20,879.64
  4. Step 4: Simplify right side
    60,865.20x = 1,906,468,146.89
  5. Step 5: Solve for x
    x = 1,906,468,146.89/60,865.20
  6. Step 6: Final answer
    x = 31,322.79

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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.