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Finding the Fourth Proportional to 211.10, 291.60 and 191.45

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Solution

The fourth proportional to 211.10, 291.60 and 191.45 is: 264.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.10 : 291.60 = 191.45 : x
  2. Step 2: Convert to fraction form
    211.10/291.60 = 191.45/x
  3. Step 3: Cross multiply
    211.10x = 291.60 × 191.45
  4. Step 4: Simplify right side
    211.10x = 55,828.27
  5. Step 5: Solve for x
    x = 55,828.27/211.10
  6. Step 6: Final answer
    x = 264.46

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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.