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Finding the Fourth Proportional to 15,215.55, 20,995 and 8,500.83

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Solution

The fourth proportional to 15,215.55, 20,995 and 8,500.83 is: 11,729.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,215.55 : 20,995 = 8,500.83 : x
  2. Step 2: Convert to fraction form
    15,215.55/20,995 = 8,500.83/x
  3. Step 3: Cross multiply
    15,215.55x = 20,995 × 8,500.83
  4. Step 4: Simplify right side
    15,215.55x = 178,474,925.85
  5. Step 5: Solve for x
    x = 178,474,925.85/15,215.55
  6. Step 6: Final answer
    x = 11,729.77

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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.