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Finding the Fourth Proportional to 231.58, 319.51 and 139.58

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Solution

The fourth proportional to 231.58, 319.51 and 139.58 is: 192.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.58 : 319.51 = 139.58 : x
  2. Step 2: Convert to fraction form
    231.58/319.51 = 139.58/x
  3. Step 3: Cross multiply
    231.58x = 319.51 × 139.58
  4. Step 4: Simplify right side
    231.58x = 44,597.21
  5. Step 5: Solve for x
    x = 44,597.21/231.58
  6. Step 6: Final answer
    x = 192.58

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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.