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Finding the Fourth Proportional to 286.25, 428.45 and 149.10

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Solution

The fourth proportional to 286.25, 428.45 and 149.10 is: 223.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.25 : 428.45 = 149.10 : x
  2. Step 2: Convert to fraction form
    286.25/428.45 = 149.10/x
  3. Step 3: Cross multiply
    286.25x = 428.45 × 149.10
  4. Step 4: Simplify right side
    286.25x = 63,881.90
  5. Step 5: Solve for x
    x = 63,881.90/286.25
  6. Step 6: Final answer
    x = 223.17

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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.