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Finding the Fourth Proportional to 279.84, 420.42 and 164.58

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Solution

The fourth proportional to 279.84, 420.42 and 164.58 is: 247.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.84 : 420.42 = 164.58 : x
  2. Step 2: Convert to fraction form
    279.84/420.42 = 164.58/x
  3. Step 3: Cross multiply
    279.84x = 420.42 × 164.58
  4. Step 4: Simplify right side
    279.84x = 69,192.72
  5. Step 5: Solve for x
    x = 69,192.72/279.84
  6. Step 6: Final answer
    x = 247.26

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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.