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Finding the Fourth Proportional to 211.28, 291.32 and 155.00

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Solution

The fourth proportional to 211.28, 291.32 and 155.00 is: 213.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.28 : 291.32 = 155.00 : x
  2. Step 2: Convert to fraction form
    211.28/291.32 = 155.00/x
  3. Step 3: Cross multiply
    211.28x = 291.32 × 155.00
  4. Step 4: Simplify right side
    211.28x = 45,154.55
  5. Step 5: Solve for x
    x = 45,154.55/211.28
  6. Step 6: Final answer
    x = 213.72

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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.