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Finding the Fourth Proportional to 13,906.64, 19,191.88 and 7,618.64

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Solution

The fourth proportional to 13,906.64, 19,191.88 and 7,618.64 is: 10,514.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,906.64 : 19,191.88 = 7,618.64 : x
  2. Step 2: Convert to fraction form
    13,906.64/19,191.88 = 7,618.64/x
  3. Step 3: Cross multiply
    13,906.64x = 19,191.88 × 7,618.64
  4. Step 4: Simplify right side
    13,906.64x = 146,216,024.64
  5. Step 5: Solve for x
    x = 146,216,024.64/13,906.64
  6. Step 6: Final answer
    x = 10,514.12

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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.