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Finding the Fourth Proportional to 18,741.32, 28,111.98 and 4,890.32

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Solution

The fourth proportional to 18,741.32, 28,111.98 and 4,890.32 is: 7,335.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,741.32 : 28,111.98 = 4,890.32 : x
  2. Step 2: Convert to fraction form
    18,741.32/28,111.98 = 4,890.32/x
  3. Step 3: Cross multiply
    18,741.32x = 28,111.98 × 4,890.32
  4. Step 4: Simplify right side
    18,741.32x = 137,476,578.03
  5. Step 5: Solve for x
    x = 137,476,578.03/18,741.32
  6. Step 6: Final answer
    x = 7,335.48

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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.