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Finding the Fourth Proportional to 18,987.11, 28,494.89 and 7,152.55

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Solution

The fourth proportional to 18,987.11, 28,494.89 and 7,152.55 is: 10,734.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.11 : 28,494.89 = 7,152.55 : x
  2. Step 2: Convert to fraction form
    18,987.11/28,494.89 = 7,152.55/x
  3. Step 3: Cross multiply
    18,987.11x = 28,494.89 × 7,152.55
  4. Step 4: Simplify right side
    18,987.11x = 203,811,205.58
  5. Step 5: Solve for x
    x = 203,811,205.58/18,987.11
  6. Step 6: Final answer
    x = 10,734.19

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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.