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Finding the Fourth Proportional to 351.66, 485.16 and 258.18

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Solution

The fourth proportional to 351.66, 485.16 and 258.18 is: 356.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.66 : 485.16 = 258.18 : x
  2. Step 2: Convert to fraction form
    351.66/485.16 = 258.18/x
  3. Step 3: Cross multiply
    351.66x = 485.16 × 258.18
  4. Step 4: Simplify right side
    351.66x = 125,258.61
  5. Step 5: Solve for x
    x = 125,258.61/351.66
  6. Step 6: Final answer
    x = 356.19

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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.