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Finding the Fourth Proportional to 18,809.70, 28,211.31 and 8,815.52

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Solution

The fourth proportional to 18,809.70, 28,211.31 and 8,815.52 is: 13,221.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,809.70 : 28,211.31 = 8,815.52 : x
  2. Step 2: Convert to fraction form
    18,809.70/28,211.31 = 8,815.52/x
  3. Step 3: Cross multiply
    18,809.70x = 28,211.31 × 8,815.52
  4. Step 4: Simplify right side
    18,809.70x = 248,697,226.47
  5. Step 5: Solve for x
    x = 248,697,226.47/18,809.70
  6. Step 6: Final answer
    x = 13,221.75

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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.