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Finding the Fourth Proportional to 279.90, 420.15 and 164.48

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Solution

The fourth proportional to 279.90, 420.15 and 164.48 is: 246.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.90 : 420.15 = 164.48 : x
  2. Step 2: Convert to fraction form
    279.90/420.15 = 164.48/x
  3. Step 3: Cross multiply
    279.90x = 420.15 × 164.48
  4. Step 4: Simplify right side
    279.90x = 69,104.17
  5. Step 5: Solve for x
    x = 69,104.17/279.90
  6. Step 6: Final answer
    x = 246.89

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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.