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Finding the Fourth Proportional to 258.66, 356.86 and 155.10

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Solution

The fourth proportional to 258.66, 356.86 and 155.10 is: 213.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.66 : 356.86 = 155.10 : x
  2. Step 2: Convert to fraction form
    258.66/356.86 = 155.10/x
  3. Step 3: Cross multiply
    258.66x = 356.86 × 155.10
  4. Step 4: Simplify right side
    258.66x = 55,348.99
  5. Step 5: Solve for x
    x = 55,348.99/258.66
  6. Step 6: Final answer
    x = 213.98

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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.