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Finding the Fourth Proportional to 15,089.20, 20,821.52 and 8,374.64

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Solution

The fourth proportional to 15,089.20, 20,821.52 and 8,374.64 is: 11,556.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,089.20 : 20,821.52 = 8,374.64 : x
  2. Step 2: Convert to fraction form
    15,089.20/20,821.52 = 8,374.64/x
  3. Step 3: Cross multiply
    15,089.20x = 20,821.52 × 8,374.64
  4. Step 4: Simplify right side
    15,089.20x = 174,372,734.25
  5. Step 5: Solve for x
    x = 174,372,734.25/15,089.20
  6. Step 6: Final answer
    x = 11,556.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.