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Finding the Fourth Proportional to 71,319.49, 106,979.13 and 21,399.49

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Solution

The fourth proportional to 71,319.49, 106,979.13 and 21,399.49 is: 32,099.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,319.49 : 106,979.13 = 21,399.49 : x
  2. Step 2: Convert to fraction form
    71,319.49/106,979.13 = 21,399.49/x
  3. Step 3: Cross multiply
    71,319.49x = 106,979.13 × 21,399.49
  4. Step 4: Simplify right side
    71,319.49x = 2,289,298,956.37
  5. Step 5: Solve for x
    x = 2,289,298,956.37/71,319.49
  6. Step 6: Final answer
    x = 32,099.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.