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Finding the Fourth Proportional to 18,970.43, 28,458.69 and 7,125.09

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Solution

The fourth proportional to 18,970.43, 28,458.69 and 7,125.09 is: 10,688.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,970.43 : 28,458.69 = 7,125.09 : x
  2. Step 2: Convert to fraction form
    18,970.43/28,458.69 = 7,125.09/x
  3. Step 3: Cross multiply
    18,970.43x = 28,458.69 × 7,125.09
  4. Step 4: Simplify right side
    18,970.43x = 202,770,714.21
  5. Step 5: Solve for x
    x = 202,770,714.21/18,970.43
  6. Step 6: Final answer
    x = 10,688.78

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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.