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Finding the Fourth Proportional to 286.30, 428.88 and 147.48

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Solution

The fourth proportional to 286.30, 428.88 and 147.48 is: 220.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.30 : 428.88 = 147.48 : x
  2. Step 2: Convert to fraction form
    286.30/428.88 = 147.48/x
  3. Step 3: Cross multiply
    286.30x = 428.88 × 147.48
  4. Step 4: Simplify right side
    286.30x = 63,251.22
  5. Step 5: Solve for x
    x = 63,251.22/286.30
  6. Step 6: Final answer
    x = 220.93

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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.