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Finding the Fourth Proportional to 210.39, 290.25 and 131.68

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Solution

The fourth proportional to 210.39, 290.25 and 131.68 is: 181.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.39 : 290.25 = 131.68 : x
  2. Step 2: Convert to fraction form
    210.39/290.25 = 131.68/x
  3. Step 3: Cross multiply
    210.39x = 290.25 × 131.68
  4. Step 4: Simplify right side
    210.39x = 38,219.46
  5. Step 5: Solve for x
    x = 38,219.46/210.39
  6. Step 6: Final answer
    x = 181.66

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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.