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Finding the Fourth Proportional to 211.32, 290.79 and 153

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Solution

The fourth proportional to 211.32, 290.79 and 153 is: 210.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.32 : 290.79 = 153 : x
  2. Step 2: Convert to fraction form
    211.32/290.79 = 153/x
  3. Step 3: Cross multiply
    211.32x = 290.79 × 153
  4. Step 4: Simplify right side
    211.32x = 44,490.87
  5. Step 5: Solve for x
    x = 44,490.87/211.32
  6. Step 6: Final answer
    x = 210.54

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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.