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Finding the Fourth Proportional to 15,087.79, 20,821.34 and 8,374.08

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Solution

The fourth proportional to 15,087.79, 20,821.34 and 8,374.08 is: 11,556.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,087.79 : 20,821.34 = 8,374.08 : x
  2. Step 2: Convert to fraction form
    15,087.79/20,821.34 = 8,374.08/x
  3. Step 3: Cross multiply
    15,087.79x = 20,821.34 × 8,374.08
  4. Step 4: Simplify right side
    15,087.79x = 174,359,566.87
  5. Step 5: Solve for x
    x = 174,359,566.87/15,087.79
  6. Step 6: Final answer
    x = 11,556.34

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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.