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Finding the Fourth Proportional to 211.32, 291.79 and 158.93

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Solution

The fourth proportional to 211.32, 291.79 and 158.93 is: 219.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.32 : 291.79 = 158.93 : x
  2. Step 2: Convert to fraction form
    211.32/291.79 = 158.93/x
  3. Step 3: Cross multiply
    211.32x = 291.79 × 158.93
  4. Step 4: Simplify right side
    211.32x = 46,374.02
  5. Step 5: Solve for x
    x = 46,374.02/211.32
  6. Step 6: Final answer
    x = 219.45

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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.