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Finding the Fourth Proportional to 18,680, 28,020.12 and 5,530.76

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Solution

The fourth proportional to 18,680, 28,020.12 and 5,530.76 is: 8,296.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,680 : 28,020.12 = 5,530.76 : x
  2. Step 2: Convert to fraction form
    18,680/28,020.12 = 5,530.76/x
  3. Step 3: Cross multiply
    18,680x = 28,020.12 × 5,530.76
  4. Step 4: Simplify right side
    18,680x = 154,972,558.89
  5. Step 5: Solve for x
    x = 154,972,558.89/18,680
  6. Step 6: Final answer
    x = 8,296.18

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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.