Home / 21,789.56-30,072.66-12,717.90

Finding the Fourth Proportional to 21,789.56, 30,072.66 and 12,717.90

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Solution

The fourth proportional to 21,789.56, 30,072.66 and 12,717.90 is: 17,552.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,789.56 : 30,072.66 = 12,717.90 : x
  2. Step 2: Convert to fraction form
    21,789.56/30,072.66 = 12,717.90/x
  3. Step 3: Cross multiply
    21,789.56x = 30,072.66 × 12,717.90
  4. Step 4: Simplify right side
    21,789.56x = 382,461,082.61
  5. Step 5: Solve for x
    x = 382,461,082.61/21,789.56
  6. Step 6: Final answer
    x = 17,552.49

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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.