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Finding the Fourth Proportional to 210.49, 290.89 and 158.21

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Solution

The fourth proportional to 210.49, 290.89 and 158.21 is: 218.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.49 : 290.89 = 158.21 : x
  2. Step 2: Convert to fraction form
    210.49/290.89 = 158.21/x
  3. Step 3: Cross multiply
    210.49x = 290.89 × 158.21
  4. Step 4: Simplify right side
    210.49x = 46,021.71
  5. Step 5: Solve for x
    x = 46,021.71/210.49
  6. Step 6: Final answer
    x = 218.64

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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.