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Finding the Fourth Proportional to 388.69, 536.40 and 211.66

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Solution

The fourth proportional to 388.69, 536.40 and 211.66 is: 292.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.69 : 536.40 = 211.66 : x
  2. Step 2: Convert to fraction form
    388.69/536.40 = 211.66/x
  3. Step 3: Cross multiply
    388.69x = 536.40 × 211.66
  4. Step 4: Simplify right side
    388.69x = 113,534.42
  5. Step 5: Solve for x
    x = 113,534.42/388.69
  6. Step 6: Final answer
    x = 292.10

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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.