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Finding the Fourth Proportional to 13,658.50, 20,491 and 4,424.50

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Solution

The fourth proportional to 13,658.50, 20,491 and 4,424.50 is: 6,637.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,658.50 : 20,491 = 4,424.50 : x
  2. Step 2: Convert to fraction form
    13,658.50/20,491 = 4,424.50/x
  3. Step 3: Cross multiply
    13,658.50x = 20,491 × 4,424.50
  4. Step 4: Simplify right side
    13,658.50x = 90,662,429.50
  5. Step 5: Solve for x
    x = 90,662,429.50/13,658.50
  6. Step 6: Final answer
    x = 6,637.80

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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.