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Finding the Fourth Proportional to 12,339.78, 18,491.45 and 5,764.20

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Solution

The fourth proportional to 12,339.78, 18,491.45 and 5,764.20 is: 8,637.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,339.78 : 18,491.45 = 5,764.20 : x
  2. Step 2: Convert to fraction form
    12,339.78/18,491.45 = 5,764.20/x
  3. Step 3: Cross multiply
    12,339.78x = 18,491.45 × 5,764.20
  4. Step 4: Simplify right side
    12,339.78x = 106,588,387.27
  5. Step 5: Solve for x
    x = 106,588,387.27/12,339.78
  6. Step 6: Final answer
    x = 8,637.79

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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.