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Finding the Fourth Proportional to 74,219.20, 111,319.90 and 20,915.17

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Solution

The fourth proportional to 74,219.20, 111,319.90 and 20,915.17 is: 31,370.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,219.20 : 111,319.90 = 20,915.17 : x
  2. Step 2: Convert to fraction form
    74,219.20/111,319.90 = 20,915.17/x
  3. Step 3: Cross multiply
    74,219.20x = 111,319.90 × 20,915.17
  4. Step 4: Simplify right side
    74,219.20x = 2,328,274,632.88
  5. Step 5: Solve for x
    x = 2,328,274,632.88/74,219.20
  6. Step 6: Final answer
    x = 31,370.25

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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.