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Finding the Fourth Proportional to 380.78, 525.45 and 225.50

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Solution

The fourth proportional to 380.78, 525.45 and 225.50 is: 311.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.78 : 525.45 = 225.50 : x
  2. Step 2: Convert to fraction form
    380.78/525.45 = 225.50/x
  3. Step 3: Cross multiply
    380.78x = 525.45 × 225.50
  4. Step 4: Simplify right side
    380.78x = 118,488.98
  5. Step 5: Solve for x
    x = 118,488.98/380.78
  6. Step 6: Final answer
    x = 311.17

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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.