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Finding the Fourth Proportional to 245.60, 338.90 and 140.71

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Solution

The fourth proportional to 245.60, 338.90 and 140.71 is: 194.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.60 : 338.90 = 140.71 : x
  2. Step 2: Convert to fraction form
    245.60/338.90 = 140.71/x
  3. Step 3: Cross multiply
    245.60x = 338.90 × 140.71
  4. Step 4: Simplify right side
    245.60x = 47,686.12
  5. Step 5: Solve for x
    x = 47,686.12/245.60
  6. Step 6: Final answer
    x = 194.17

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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.