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Finding the Fourth Proportional to 22,220.16, 30,665 and 12,791.76

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Solution

The fourth proportional to 22,220.16, 30,665 and 12,791.76 is: 17,653.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,220.16 : 30,665 = 12,791.76 : x
  2. Step 2: Convert to fraction form
    22,220.16/30,665 = 12,791.76/x
  3. Step 3: Cross multiply
    22,220.16x = 30,665 × 12,791.76
  4. Step 4: Simplify right side
    22,220.16x = 392,259,320.40
  5. Step 5: Solve for x
    x = 392,259,320.40/22,220.16
  6. Step 6: Final answer
    x = 17,653.31

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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.