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Finding the Fourth Proportional to 211.38, 291.72 and 153.19

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Solution

The fourth proportional to 211.38, 291.72 and 153.19 is: 211.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.38 : 291.72 = 153.19 : x
  2. Step 2: Convert to fraction form
    211.38/291.72 = 153.19/x
  3. Step 3: Cross multiply
    211.38x = 291.72 × 153.19
  4. Step 4: Simplify right side
    211.38x = 44,688.59
  5. Step 5: Solve for x
    x = 44,688.59/211.38
  6. Step 6: Final answer
    x = 211.41

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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.