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Finding the Fourth Proportional to 386.25, 533.02 and 211.59

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Solution

The fourth proportional to 386.25, 533.02 and 211.59 is: 291.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.25 : 533.02 = 211.59 : x
  2. Step 2: Convert to fraction form
    386.25/533.02 = 211.59/x
  3. Step 3: Cross multiply
    386.25x = 533.02 × 211.59
  4. Step 4: Simplify right side
    386.25x = 112,781.70
  5. Step 5: Solve for x
    x = 112,781.70/386.25
  6. Step 6: Final answer
    x = 291.99

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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.