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Finding the Fourth Proportional to 230.79, 345.78 and 139.23

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Solution

The fourth proportional to 230.79, 345.78 and 139.23 is: 208.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.79 : 345.78 = 139.23 : x
  2. Step 2: Convert to fraction form
    230.79/345.78 = 139.23/x
  3. Step 3: Cross multiply
    230.79x = 345.78 × 139.23
  4. Step 4: Simplify right side
    230.79x = 48,142.95
  5. Step 5: Solve for x
    x = 48,142.95/230.79
  6. Step 6: Final answer
    x = 208.60

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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.