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Finding the Fourth Proportional to 211.50, 291.90 and 127.45

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Solution

The fourth proportional to 211.50, 291.90 and 127.45 is: 175.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.50 : 291.90 = 127.45 : x
  2. Step 2: Convert to fraction form
    211.50/291.90 = 127.45/x
  3. Step 3: Cross multiply
    211.50x = 291.90 × 127.45
  4. Step 4: Simplify right side
    211.50x = 37,202.66
  5. Step 5: Solve for x
    x = 37,202.66/211.50
  6. Step 6: Final answer
    x = 175.90

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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.