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Finding the Fourth Proportional to 388.04, 535.50 and 211

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Solution

The fourth proportional to 388.04, 535.50 and 211 is: 291.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.04 : 535.50 = 211 : x
  2. Step 2: Convert to fraction form
    388.04/535.50 = 211/x
  3. Step 3: Cross multiply
    388.04x = 535.50 × 211
  4. Step 4: Simplify right side
    388.04x = 112,990.50
  5. Step 5: Solve for x
    x = 112,990.50/388.04
  6. Step 6: Final answer
    x = 291.18

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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.