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Finding the Fourth Proportional to 14,121.60, 19,487 and 7,747

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Solution

The fourth proportional to 14,121.60, 19,487 and 7,747 is: 10,690.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,121.60 : 19,487 = 7,747 : x
  2. Step 2: Convert to fraction form
    14,121.60/19,487 = 7,747/x
  3. Step 3: Cross multiply
    14,121.60x = 19,487 × 7,747
  4. Step 4: Simplify right side
    14,121.60x = 150,965,789
  5. Step 5: Solve for x
    x = 150,965,789/14,121.60
  6. Step 6: Final answer
    x = 10,690.42

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1.5x scale

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.