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Finding the Fourth Proportional to 250.55, 345.78 and 138.53

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Solution

The fourth proportional to 250.55, 345.78 and 138.53 is: 191.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.55 : 345.78 = 138.53 : x
  2. Step 2: Convert to fraction form
    250.55/345.78 = 138.53/x
  3. Step 3: Cross multiply
    250.55x = 345.78 × 138.53
  4. Step 4: Simplify right side
    250.55x = 47,900.02
  5. Step 5: Solve for x
    x = 47,900.02/250.55
  6. Step 6: Final answer
    x = 191.18

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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.