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Finding the Fourth Proportional to 21,994.35, 33,005.70 and 12,140.70

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Solution

The fourth proportional to 21,994.35, 33,005.70 and 12,140.70 is: 18,218.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,994.35 : 33,005.70 = 12,140.70 : x
  2. Step 2: Convert to fraction form
    21,994.35/33,005.70 = 12,140.70/x
  3. Step 3: Cross multiply
    21,994.35x = 33,005.70 × 12,140.70
  4. Step 4: Simplify right side
    21,994.35x = 400,712,301.99
  5. Step 5: Solve for x
    x = 400,712,301.99/21,994.35
  6. Step 6: Final answer
    x = 18,218.87

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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.