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Finding the Fourth Proportional to 279.74, 419.40 and 171.60

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Solution

The fourth proportional to 279.74, 419.40 and 171.60 is: 257.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.74 : 419.40 = 171.60 : x
  2. Step 2: Convert to fraction form
    279.74/419.40 = 171.60/x
  3. Step 3: Cross multiply
    279.74x = 419.40 × 171.60
  4. Step 4: Simplify right side
    279.74x = 71,969.04
  5. Step 5: Solve for x
    x = 71,969.04/279.74
  6. Step 6: Final answer
    x = 257.28

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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.