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Finding the Fourth Proportional to 12,221.89, 16,865.08 and 6,915.85

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Solution

The fourth proportional to 12,221.89, 16,865.08 and 6,915.85 is: 9,543.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,221.89 : 16,865.08 = 6,915.85 : x
  2. Step 2: Convert to fraction form
    12,221.89/16,865.08 = 6,915.85/x
  3. Step 3: Cross multiply
    12,221.89x = 16,865.08 × 6,915.85
  4. Step 4: Simplify right side
    12,221.89x = 116,636,363.52
  5. Step 5: Solve for x
    x = 116,636,363.52/12,221.89
  6. Step 6: Final answer
    x = 9,543.23

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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.