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Finding the Fourth Proportional to 279.71, 419.67 and 106.39

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Solution

The fourth proportional to 279.71, 419.67 and 106.39 is: 159.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.71 : 419.67 = 106.39 : x
  2. Step 2: Convert to fraction form
    279.71/419.67 = 106.39/x
  3. Step 3: Cross multiply
    279.71x = 419.67 × 106.39
  4. Step 4: Simplify right side
    279.71x = 44,646.06
  5. Step 5: Solve for x
    x = 44,646.06/279.71
  6. Step 6: Final answer
    x = 159.62

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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.