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Finding the Fourth Proportional to 18,685.70, 28,020.24 and 9,918.62

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Solution

The fourth proportional to 18,685.70, 28,020.24 and 9,918.62 is: 14,873.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,685.70 : 28,020.24 = 9,918.62 : x
  2. Step 2: Convert to fraction form
    18,685.70/28,020.24 = 9,918.62/x
  3. Step 3: Cross multiply
    18,685.70x = 28,020.24 × 9,918.62
  4. Step 4: Simplify right side
    18,685.70x = 277,922,112.87
  5. Step 5: Solve for x
    x = 277,922,112.87/18,685.70
  6. Step 6: Final answer
    x = 14,873.52

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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.