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Finding the Fourth Proportional to 210.55, 290.55 and 117.31

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Solution

The fourth proportional to 210.55, 290.55 and 117.31 is: 161.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.55 : 290.55 = 117.31 : x
  2. Step 2: Convert to fraction form
    210.55/290.55 = 117.31/x
  3. Step 3: Cross multiply
    210.55x = 290.55 × 117.31
  4. Step 4: Simplify right side
    210.55x = 34,083.77
  5. Step 5: Solve for x
    x = 34,083.77/210.55
  6. Step 6: Final answer
    x = 161.88

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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.