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Finding the Fourth Proportional to 204.78, 307.20 and 60.50

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Solution

The fourth proportional to 204.78, 307.20 and 60.50 is: 90.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.78 : 307.20 = 60.50 : x
  2. Step 2: Convert to fraction form
    204.78/307.20 = 60.50/x
  3. Step 3: Cross multiply
    204.78x = 307.20 × 60.50
  4. Step 4: Simplify right side
    204.78x = 18,585.60
  5. Step 5: Solve for x
    x = 18,585.60/204.78
  6. Step 6: Final answer
    x = 90.76

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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.