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Finding the Fourth Proportional to 250.67, 345.91 and 138.63

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Solution

The fourth proportional to 250.67, 345.91 and 138.63 is: 191.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.67 : 345.91 = 138.63 : x
  2. Step 2: Convert to fraction form
    250.67/345.91 = 138.63/x
  3. Step 3: Cross multiply
    250.67x = 345.91 × 138.63
  4. Step 4: Simplify right side
    250.67x = 47,953.16
  5. Step 5: Solve for x
    x = 47,953.16/250.67
  6. Step 6: Final answer
    x = 191.30

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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.