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Finding the Fourth Proportional to 19,700.78, 27,179.07 and 12,631.34

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Solution

The fourth proportional to 19,700.78, 27,179.07 and 12,631.34 is: 17,426.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,700.78 : 27,179.07 = 12,631.34 : x
  2. Step 2: Convert to fraction form
    19,700.78/27,179.07 = 12,631.34/x
  3. Step 3: Cross multiply
    19,700.78x = 27,179.07 × 12,631.34
  4. Step 4: Simplify right side
    19,700.78x = 343,308,074.05
  5. Step 5: Solve for x
    x = 343,308,074.05/19,700.78
  6. Step 6: Final answer
    x = 17,426.12

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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.