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Finding the Fourth Proportional to 159.66, 220.40 and 143.26

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Solution

The fourth proportional to 159.66, 220.40 and 143.26 is: 197.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.66 : 220.40 = 143.26 : x
  2. Step 2: Convert to fraction form
    159.66/220.40 = 143.26/x
  3. Step 3: Cross multiply
    159.66x = 220.40 × 143.26
  4. Step 4: Simplify right side
    159.66x = 31,573.79
  5. Step 5: Solve for x
    x = 31,573.79/159.66
  6. Step 6: Final answer
    x = 197.75

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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.