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Finding the Fourth Proportional to 20,492.87, 28,279.88 and 11,540.48

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Solution

The fourth proportional to 20,492.87, 28,279.88 and 11,540.48 is: 15,925.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,492.87 : 28,279.88 = 11,540.48 : x
  2. Step 2: Convert to fraction form
    20,492.87/28,279.88 = 11,540.48/x
  3. Step 3: Cross multiply
    20,492.87x = 28,279.88 × 11,540.48
  4. Step 4: Simplify right side
    20,492.87x = 326,363,389.54
  5. Step 5: Solve for x
    x = 326,363,389.54/20,492.87
  6. Step 6: Final answer
    x = 15,925.70

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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.