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Finding the Fourth Proportional to 14,135.70, 21,203.55 and 7,991.70

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Solution

The fourth proportional to 14,135.70, 21,203.55 and 7,991.70 is: 11,987.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,135.70 : 21,203.55 = 7,991.70 : x
  2. Step 2: Convert to fraction form
    14,135.70/21,203.55 = 7,991.70/x
  3. Step 3: Cross multiply
    14,135.70x = 21,203.55 × 7,991.70
  4. Step 4: Simplify right side
    14,135.70x = 169,452,410.54
  5. Step 5: Solve for x
    x = 169,452,410.54/14,135.70
  6. Step 6: Final answer
    x = 11,987.55

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Similar ratio
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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.