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Finding the Fourth Proportional to 79,893.76, 119,839.68 and 20,724.16

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Solution

The fourth proportional to 79,893.76, 119,839.68 and 20,724.16 is: 31,085.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,893.76 : 119,839.68 = 20,724.16 : x
  2. Step 2: Convert to fraction form
    79,893.76/119,839.68 = 20,724.16/x
  3. Step 3: Cross multiply
    79,893.76x = 119,839.68 × 20,724.16
  4. Step 4: Simplify right side
    79,893.76x = 2,483,576,702.67
  5. Step 5: Solve for x
    x = 2,483,576,702.67/79,893.76
  6. Step 6: Final answer
    x = 31,085.99

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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.