Home / 21,217.85-31,815.84-8,735.55

Finding the Fourth Proportional to 21,217.85, 31,815.84 and 8,735.55

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Solution

The fourth proportional to 21,217.85, 31,815.84 and 8,735.55 is: 13,098.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,217.85 : 31,815.84 = 8,735.55 : x
  2. Step 2: Convert to fraction form
    21,217.85/31,815.84 = 8,735.55/x
  3. Step 3: Cross multiply
    21,217.85x = 31,815.84 × 8,735.55
  4. Step 4: Simplify right side
    21,217.85x = 277,928,725.42
  5. Step 5: Solve for x
    x = 277,928,725.42/21,217.85
  6. Step 6: Final answer
    x = 13,098.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.