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Finding the Fourth Proportional to 21,855.70, 30,164.80 and 12,902.68

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Solution

The fourth proportional to 21,855.70, 30,164.80 and 12,902.68 is: 17,808.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,855.70 : 30,164.80 = 12,902.68 : x
  2. Step 2: Convert to fraction form
    21,855.70/30,164.80 = 12,902.68/x
  3. Step 3: Cross multiply
    21,855.70x = 30,164.80 × 12,902.68
  4. Step 4: Simplify right side
    21,855.70x = 389,206,761.66
  5. Step 5: Solve for x
    x = 389,206,761.66/21,855.70
  6. Step 6: Final answer
    x = 17,808.02

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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.