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Finding the Fourth Proportional to 60,709.20, 91,063.80 and 21,253.20

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Solution

The fourth proportional to 60,709.20, 91,063.80 and 21,253.20 is: 31,879.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,709.20 : 91,063.80 = 21,253.20 : x
  2. Step 2: Convert to fraction form
    60,709.20/91,063.80 = 21,253.20/x
  3. Step 3: Cross multiply
    60,709.20x = 91,063.80 × 21,253.20
  4. Step 4: Simplify right side
    60,709.20x = 1,935,397,154.16
  5. Step 5: Solve for x
    x = 1,935,397,154.16/60,709.20
  6. Step 6: Final answer
    x = 31,879.80

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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.