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Finding the Fourth Proportional to 15,087.81, 20,820.78 and 8,373.42

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Solution

The fourth proportional to 15,087.81, 20,820.78 and 8,373.42 is: 11,555.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,087.81 : 20,820.78 = 8,373.42 : x
  2. Step 2: Convert to fraction form
    15,087.81/20,820.78 = 8,373.42/x
  3. Step 3: Cross multiply
    15,087.81x = 20,820.78 × 8,373.42
  4. Step 4: Simplify right side
    15,087.81x = 174,341,135.67
  5. Step 5: Solve for x
    x = 174,341,135.67/15,087.81
  6. Step 6: Final answer
    x = 11,555.10

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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.