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Finding the Fourth Proportional to 258.04, 386.29 and 214.30

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Solution

The fourth proportional to 258.04, 386.29 and 214.30 is: 320.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.04 : 386.29 = 214.30 : x
  2. Step 2: Convert to fraction form
    258.04/386.29 = 214.30/x
  3. Step 3: Cross multiply
    258.04x = 386.29 × 214.30
  4. Step 4: Simplify right side
    258.04x = 82,781.95
  5. Step 5: Solve for x
    x = 82,781.95/258.04
  6. Step 6: Final answer
    x = 320.81

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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.