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Finding the Fourth Proportional to 210.60, 290.45 and 123.19

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Solution

The fourth proportional to 210.60, 290.45 and 123.19 is: 169.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.60 : 290.45 = 123.19 : x
  2. Step 2: Convert to fraction form
    210.60/290.45 = 123.19/x
  3. Step 3: Cross multiply
    210.60x = 290.45 × 123.19
  4. Step 4: Simplify right side
    210.60x = 35,780.12
  5. Step 5: Solve for x
    x = 35,780.12/210.60
  6. Step 6: Final answer
    x = 169.90

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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.