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Finding the Fourth Proportional to 258.02, 387.78 and 167.30

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Solution

The fourth proportional to 258.02, 387.78 and 167.30 is: 251.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.02 : 387.78 = 167.30 : x
  2. Step 2: Convert to fraction form
    258.02/387.78 = 167.30/x
  3. Step 3: Cross multiply
    258.02x = 387.78 × 167.30
  4. Step 4: Simplify right side
    258.02x = 64,875.59
  5. Step 5: Solve for x
    x = 64,875.59/258.02
  6. Step 6: Final answer
    x = 251.44

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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.