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Finding the Fourth Proportional to 279.71, 419.47 and 117.31

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Solution

The fourth proportional to 279.71, 419.47 and 117.31 is: 175.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.71 : 419.47 = 117.31 : x
  2. Step 2: Convert to fraction form
    279.71/419.47 = 117.31/x
  3. Step 3: Cross multiply
    279.71x = 419.47 × 117.31
  4. Step 4: Simplify right side
    279.71x = 49,208.03
  5. Step 5: Solve for x
    x = 49,208.03/279.71
  6. Step 6: Final answer
    x = 175.93

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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.