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Finding the Fourth Proportional to 22,215.76, 30,615.52 and 15,917.20

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Solution

The fourth proportional to 22,215.76, 30,615.52 and 15,917.20 is: 21,935.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,215.76 : 30,615.52 = 15,917.20 : x
  2. Step 2: Convert to fraction form
    22,215.76/30,615.52 = 15,917.20/x
  3. Step 3: Cross multiply
    22,215.76x = 30,615.52 × 15,917.20
  4. Step 4: Simplify right side
    22,215.76x = 487,313,354.94
  5. Step 5: Solve for x
    x = 487,313,354.94/22,215.76
  6. Step 6: Final answer
    x = 21,935.48

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.