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Finding the Fourth Proportional to 211.16, 291.20 and 155.72

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Solution

The fourth proportional to 211.16, 291.20 and 155.72 is: 214.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.16 : 291.20 = 155.72 : x
  2. Step 2: Convert to fraction form
    211.16/291.20 = 155.72/x
  3. Step 3: Cross multiply
    211.16x = 291.20 × 155.72
  4. Step 4: Simplify right side
    211.16x = 45,345.66
  5. Step 5: Solve for x
    x = 45,345.66/211.16
  6. Step 6: Final answer
    x = 214.75

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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.