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Finding the Fourth Proportional to 158.47, 218.52 and 121.54

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Solution

The fourth proportional to 158.47, 218.52 and 121.54 is: 167.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.47 : 218.52 = 121.54 : x
  2. Step 2: Convert to fraction form
    158.47/218.52 = 121.54/x
  3. Step 3: Cross multiply
    158.47x = 218.52 × 121.54
  4. Step 4: Simplify right side
    158.47x = 26,558.92
  5. Step 5: Solve for x
    x = 26,558.92/158.47
  6. Step 6: Final answer
    x = 167.60

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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.