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Finding the Fourth Proportional to 21,747.60, 30,013.80 and 12,189.11

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Solution

The fourth proportional to 21,747.60, 30,013.80 and 12,189.11 is: 16,822.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,747.60 : 30,013.80 = 12,189.11 : x
  2. Step 2: Convert to fraction form
    21,747.60/30,013.80 = 12,189.11/x
  3. Step 3: Cross multiply
    21,747.60x = 30,013.80 × 12,189.11
  4. Step 4: Simplify right side
    21,747.60x = 365,841,298.70
  5. Step 5: Solve for x
    x = 365,841,298.70/21,747.60
  6. Step 6: Final answer
    x = 16,822.15

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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.