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Finding the Fourth Proportional to 21,572.28, 29,763.93 and 12,621.99

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Solution

The fourth proportional to 21,572.28, 29,763.93 and 12,621.99 is: 17,414.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,572.28 : 29,763.93 = 12,621.99 : x
  2. Step 2: Convert to fraction form
    21,572.28/29,763.93 = 12,621.99/x
  3. Step 3: Cross multiply
    21,572.28x = 29,763.93 × 12,621.99
  4. Step 4: Simplify right side
    21,572.28x = 375,680,026.82
  5. Step 5: Solve for x
    x = 375,680,026.82/21,572.28
  6. Step 6: Final answer
    x = 17,414.94

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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.