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Finding the Fourth Proportional to 388.15, 535.65 and 211.11

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Solution

The fourth proportional to 388.15, 535.65 and 211.11 is: 291.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.15 : 535.65 = 211.11 : x
  2. Step 2: Convert to fraction form
    388.15/535.65 = 211.11/x
  3. Step 3: Cross multiply
    388.15x = 535.65 × 211.11
  4. Step 4: Simplify right side
    388.15x = 113,080.02
  5. Step 5: Solve for x
    x = 113,080.02/388.15
  6. Step 6: Final answer
    x = 291.33

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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.