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Finding the Fourth Proportional to 394.51, 591.39 and 147.58

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Solution

The fourth proportional to 394.51, 591.39 and 147.58 is: 221.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.51 : 591.39 = 147.58 : x
  2. Step 2: Convert to fraction form
    394.51/591.39 = 147.58/x
  3. Step 3: Cross multiply
    394.51x = 591.39 × 147.58
  4. Step 4: Simplify right side
    394.51x = 87,277.34
  5. Step 5: Solve for x
    x = 87,277.34/394.51
  6. Step 6: Final answer
    x = 221.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.