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Finding the Fourth Proportional to 19,915.20, 29,874.96 and 7,441.20

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Solution

The fourth proportional to 19,915.20, 29,874.96 and 7,441.20 is: 11,162.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,915.20 : 29,874.96 = 7,441.20 : x
  2. Step 2: Convert to fraction form
    19,915.20/29,874.96 = 7,441.20/x
  3. Step 3: Cross multiply
    19,915.20x = 29,874.96 × 7,441.20
  4. Step 4: Simplify right side
    19,915.20x = 222,305,552.35
  5. Step 5: Solve for x
    x = 222,305,552.35/19,915.20
  6. Step 6: Final answer
    x = 11,162.61

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1.5x scale

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.