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Finding the Fourth Proportional to 210.81, 290.76 and 137.19

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Solution

The fourth proportional to 210.81, 290.76 and 137.19 is: 189.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.81 : 290.76 = 137.19 : x
  2. Step 2: Convert to fraction form
    210.81/290.76 = 137.19/x
  3. Step 3: Cross multiply
    210.81x = 290.76 × 137.19
  4. Step 4: Simplify right side
    210.81x = 39,889.36
  5. Step 5: Solve for x
    x = 39,889.36/210.81
  6. Step 6: Final answer
    x = 189.22

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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.