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Finding the Fourth Proportional to 18,891.60, 28,319.40 and 7,042.20

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Solution

The fourth proportional to 18,891.60, 28,319.40 and 7,042.20 is: 10,556.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,891.60 : 28,319.40 = 7,042.20 : x
  2. Step 2: Convert to fraction form
    18,891.60/28,319.40 = 7,042.20/x
  3. Step 3: Cross multiply
    18,891.60x = 28,319.40 × 7,042.20
  4. Step 4: Simplify right side
    18,891.60x = 199,430,878.68
  5. Step 5: Solve for x
    x = 199,430,878.68/18,891.60
  6. Step 6: Final answer
    x = 10,556.59

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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.