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Finding the Fourth Proportional to 21,709.40, 29,947.02 and 12,752.60

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Solution

The fourth proportional to 21,709.40, 29,947.02 and 12,752.60 is: 17,591.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,709.40 : 29,947.02 = 12,752.60 : x
  2. Step 2: Convert to fraction form
    21,709.40/29,947.02 = 12,752.60/x
  3. Step 3: Cross multiply
    21,709.40x = 29,947.02 × 12,752.60
  4. Step 4: Simplify right side
    21,709.40x = 381,902,367.25
  5. Step 5: Solve for x
    x = 381,902,367.25/21,709.40
  6. Step 6: Final answer
    x = 17,591.57

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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.