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Finding the Fourth Proportional to 18,841.67, 28,235.74 and 13,872.32

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Solution

The fourth proportional to 18,841.67, 28,235.74 and 13,872.32 is: 20,788.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,841.67 : 28,235.74 = 13,872.32 : x
  2. Step 2: Convert to fraction form
    18,841.67/28,235.74 = 13,872.32/x
  3. Step 3: Cross multiply
    18,841.67x = 28,235.74 × 13,872.32
  4. Step 4: Simplify right side
    18,841.67x = 391,695,151.36
  5. Step 5: Solve for x
    x = 391,695,151.36/18,841.67
  6. Step 6: Final answer
    x = 20,788.77

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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.