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Finding the Fourth Proportional to 60,979.20, 91,468.80 and 21,580.80

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Solution

The fourth proportional to 60,979.20, 91,468.80 and 21,580.80 is: 32,371.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,979.20 : 91,468.80 = 21,580.80 : x
  2. Step 2: Convert to fraction form
    60,979.20/91,468.80 = 21,580.80/x
  3. Step 3: Cross multiply
    60,979.20x = 91,468.80 × 21,580.80
  4. Step 4: Simplify right side
    60,979.20x = 1,973,969,879.04
  5. Step 5: Solve for x
    x = 1,973,969,879.04/60,979.20
  6. Step 6: Final answer
    x = 32,371.20

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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.