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Finding the Fourth Proportional to 18,781.53, 28,148.81 and 8,901.15

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Solution

The fourth proportional to 18,781.53, 28,148.81 and 8,901.15 is: 13,340.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.53 : 28,148.81 = 8,901.15 : x
  2. Step 2: Convert to fraction form
    18,781.53/28,148.81 = 8,901.15/x
  3. Step 3: Cross multiply
    18,781.53x = 28,148.81 × 8,901.15
  4. Step 4: Simplify right side
    18,781.53x = 250,556,735.63
  5. Step 5: Solve for x
    x = 250,556,735.63/18,781.53
  6. Step 6: Final answer
    x = 13,340.59

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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.