Home / 15,122.79-20,870.22-8,408.55

Finding the Fourth Proportional to 15,122.79, 20,870.22 and 8,408.55

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Solution

The fourth proportional to 15,122.79, 20,870.22 and 8,408.55 is: 11,604.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,122.79 : 20,870.22 = 8,408.55 : x
  2. Step 2: Convert to fraction form
    15,122.79/20,870.22 = 8,408.55/x
  3. Step 3: Cross multiply
    15,122.79x = 20,870.22 × 8,408.55
  4. Step 4: Simplify right side
    15,122.79x = 175,488,288.38
  5. Step 5: Solve for x
    x = 175,488,288.38/15,122.79
  6. Step 6: Final answer
    x = 11,604.23

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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.