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Finding the Fourth Proportional to 20,891.66, 28,832.10 and 12,938.54

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Solution

The fourth proportional to 20,891.66, 28,832.10 and 12,938.54 is: 17,856.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.66 : 28,832.10 = 12,938.54 : x
  2. Step 2: Convert to fraction form
    20,891.66/28,832.10 = 12,938.54/x
  3. Step 3: Cross multiply
    20,891.66x = 28,832.10 × 12,938.54
  4. Step 4: Simplify right side
    20,891.66x = 373,045,279.13
  5. Step 5: Solve for x
    x = 373,045,279.13/20,891.66
  6. Step 6: Final answer
    x = 17,856.18

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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.