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Finding the Fourth Proportional to 210.42, 290.56 and 136.71

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Solution

The fourth proportional to 210.42, 290.56 and 136.71 is: 188.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.42 : 290.56 = 136.71 : x
  2. Step 2: Convert to fraction form
    210.42/290.56 = 136.71/x
  3. Step 3: Cross multiply
    210.42x = 290.56 × 136.71
  4. Step 4: Simplify right side
    210.42x = 39,722.46
  5. Step 5: Solve for x
    x = 39,722.46/210.42
  6. Step 6: Final answer
    x = 188.78

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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.