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Finding the Fourth Proportional to 279.68, 419.61 and 84.70

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Solution

The fourth proportional to 279.68, 419.61 and 84.70 is: 127.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.68 : 419.61 = 84.70 : x
  2. Step 2: Convert to fraction form
    279.68/419.61 = 84.70/x
  3. Step 3: Cross multiply
    279.68x = 419.61 × 84.70
  4. Step 4: Simplify right side
    279.68x = 35,538.73
  5. Step 5: Solve for x
    x = 35,538.73/279.68
  6. Step 6: Final answer
    x = 127.07

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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.