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Finding the Fourth Proportional to 13,591.12, 18,755.52 and 7,929.16

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Solution

The fourth proportional to 13,591.12, 18,755.52 and 7,929.16 is: 10,942.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,591.12 : 18,755.52 = 7,929.16 : x
  2. Step 2: Convert to fraction form
    13,591.12/18,755.52 = 7,929.16/x
  3. Step 3: Cross multiply
    13,591.12x = 18,755.52 × 7,929.16
  4. Step 4: Simplify right side
    13,591.12x = 148,715,518.96
  5. Step 5: Solve for x
    x = 148,715,518.96/13,591.12
  6. Step 6: Final answer
    x = 10,942.11

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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.