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Finding the Fourth Proportional to 286.10, 393.68 and 258.50

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Solution

The fourth proportional to 286.10, 393.68 and 258.50 is: 355.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.10 : 393.68 = 258.50 : x
  2. Step 2: Convert to fraction form
    286.10/393.68 = 258.50/x
  3. Step 3: Cross multiply
    286.10x = 393.68 × 258.50
  4. Step 4: Simplify right side
    286.10x = 101,766.28
  5. Step 5: Solve for x
    x = 101,766.28/286.10
  6. Step 6: Final answer
    x = 355.70

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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.