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Finding the Fourth Proportional to 18,279.81, 27,420.12 and 5,131.89

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Solution

The fourth proportional to 18,279.81, 27,420.12 and 5,131.89 is: 7,697.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,279.81 : 27,420.12 = 5,131.89 : x
  2. Step 2: Convert to fraction form
    18,279.81/27,420.12 = 5,131.89/x
  3. Step 3: Cross multiply
    18,279.81x = 27,420.12 × 5,131.89
  4. Step 4: Simplify right side
    18,279.81x = 140,717,039.63
  5. Step 5: Solve for x
    x = 140,717,039.63/18,279.81
  6. Step 6: Final answer
    x = 7,697.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.