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Finding the Fourth Proportional to 15,134.42, 20,885.56 and 8,420.42

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Solution

The fourth proportional to 15,134.42, 20,885.56 and 8,420.42 is: 11,620.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,134.42 : 20,885.56 = 8,420.42 : x
  2. Step 2: Convert to fraction form
    15,134.42/20,885.56 = 8,420.42/x
  3. Step 3: Cross multiply
    15,134.42x = 20,885.56 × 8,420.42
  4. Step 4: Simplify right side
    15,134.42x = 175,865,187.14
  5. Step 5: Solve for x
    x = 175,865,187.14/15,134.42
  6. Step 6: Final answer
    x = 11,620.21

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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.