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Finding the Fourth Proportional to 230.42, 345.30 and 139.19

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Solution

The fourth proportional to 230.42, 345.30 and 139.19 is: 208.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.42 : 345.30 = 139.19 : x
  2. Step 2: Convert to fraction form
    230.42/345.30 = 139.19/x
  3. Step 3: Cross multiply
    230.42x = 345.30 × 139.19
  4. Step 4: Simplify right side
    230.42x = 48,060.58
  5. Step 5: Solve for x
    x = 48,060.58/230.42
  6. Step 6: Final answer
    x = 208.58

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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.