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Finding the Fourth Proportional to 18,841.78, 28,271.85 and 7,751.80

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Solution

The fourth proportional to 18,841.78, 28,271.85 and 7,751.80 is: 11,631.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,841.78 : 28,271.85 = 7,751.80 : x
  2. Step 2: Convert to fraction form
    18,841.78/28,271.85 = 7,751.80/x
  3. Step 3: Cross multiply
    18,841.78x = 28,271.85 × 7,751.80
  4. Step 4: Simplify right side
    18,841.78x = 219,157,726.83
  5. Step 5: Solve for x
    x = 219,157,726.83/18,841.78
  6. Step 6: Final answer
    x = 11,631.48

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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.