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Finding the Fourth Proportional to 258.81, 387.32 and 212.00

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Solution

The fourth proportional to 258.81, 387.32 and 212.00 is: 317.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.81 : 387.32 = 212.00 : x
  2. Step 2: Convert to fraction form
    258.81/387.32 = 212.00/x
  3. Step 3: Cross multiply
    258.81x = 387.32 × 212.00
  4. Step 4: Simplify right side
    258.81x = 82,108.84
  5. Step 5: Solve for x
    x = 82,108.84/258.81
  6. Step 6: Final answer
    x = 317.26

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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.