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Finding the Fourth Proportional to 18,719.70, 25,830.14 and 11,061.91

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Solution

The fourth proportional to 18,719.70, 25,830.14 and 11,061.91 is: 15,263.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.70 : 25,830.14 = 11,061.91 : x
  2. Step 2: Convert to fraction form
    18,719.70/25,830.14 = 11,061.91/x
  3. Step 3: Cross multiply
    18,719.70x = 25,830.14 × 11,061.91
  4. Step 4: Simplify right side
    18,719.70x = 285,730,628.66
  5. Step 5: Solve for x
    x = 285,730,628.66/18,719.70
  6. Step 6: Final answer
    x = 15,263.63

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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.