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Finding the Fourth Proportional to 258.66, 357.15 and 209.46

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Solution

The fourth proportional to 258.66, 357.15 and 209.46 is: 289.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.66 : 357.15 = 209.46 : x
  2. Step 2: Convert to fraction form
    258.66/357.15 = 209.46/x
  3. Step 3: Cross multiply
    258.66x = 357.15 × 209.46
  4. Step 4: Simplify right side
    258.66x = 74,808.64
  5. Step 5: Solve for x
    x = 74,808.64/258.66
  6. Step 6: Final answer
    x = 289.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.