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Finding the Fourth Proportional to 279.69, 419.29 and 117.49

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Solution

The fourth proportional to 279.69, 419.29 and 117.49 is: 176.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.69 : 419.29 = 117.49 : x
  2. Step 2: Convert to fraction form
    279.69/419.29 = 117.49/x
  3. Step 3: Cross multiply
    279.69x = 419.29 × 117.49
  4. Step 4: Simplify right side
    279.69x = 49,262.38
  5. Step 5: Solve for x
    x = 49,262.38/279.69
  6. Step 6: Final answer
    x = 176.13

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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.