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Finding the Fourth Proportional to 356.87, 492.09 and 258.68

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Solution

The fourth proportional to 356.87, 492.09 and 258.68 is: 356.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.87 : 492.09 = 258.68 : x
  2. Step 2: Convert to fraction form
    356.87/492.09 = 258.68/x
  3. Step 3: Cross multiply
    356.87x = 492.09 × 258.68
  4. Step 4: Simplify right side
    356.87x = 127,293.84
  5. Step 5: Solve for x
    x = 127,293.84/356.87
  6. Step 6: Final answer
    x = 356.70

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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.