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Finding the Fourth Proportional to 20,934.90, 28,890 and 11,503.44

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Solution

The fourth proportional to 20,934.90, 28,890 and 11,503.44 is: 15,874.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,934.90 : 28,890 = 11,503.44 : x
  2. Step 2: Convert to fraction form
    20,934.90/28,890 = 11,503.44/x
  3. Step 3: Cross multiply
    20,934.90x = 28,890 × 11,503.44
  4. Step 4: Simplify right side
    20,934.90x = 332,334,381.60
  5. Step 5: Solve for x
    x = 332,334,381.60/20,934.90
  6. Step 6: Final answer
    x = 15,874.66

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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.