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Finding the Fourth Proportional to 158.00, 217.64 and 121.10

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Solution

The fourth proportional to 158.00, 217.64 and 121.10 is: 166.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.00 : 217.64 = 121.10 : x
  2. Step 2: Convert to fraction form
    158.00/217.64 = 121.10/x
  3. Step 3: Cross multiply
    158.00x = 217.64 × 121.10
  4. Step 4: Simplify right side
    158.00x = 26,354.74
  5. Step 5: Solve for x
    x = 26,354.74/158.00
  6. Step 6: Final answer
    x = 166.80

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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.