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Finding the Fourth Proportional to 21,506.70, 29,680.72 and 11,947.68

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Solution

The fourth proportional to 21,506.70, 29,680.72 and 11,947.68 is: 16,488.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,506.70 : 29,680.72 = 11,947.68 : x
  2. Step 2: Convert to fraction form
    21,506.70/29,680.72 = 11,947.68/x
  3. Step 3: Cross multiply
    21,506.70x = 29,680.72 × 11,947.68
  4. Step 4: Simplify right side
    21,506.70x = 354,615,744.73
  5. Step 5: Solve for x
    x = 354,615,744.73/21,506.70
  6. Step 6: Final answer
    x = 16,488.62

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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.