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Finding the Fourth Proportional to 245.90, 339.45 and 147.71

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Solution

The fourth proportional to 245.90, 339.45 and 147.71 is: 203.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.90 : 339.45 = 147.71 : x
  2. Step 2: Convert to fraction form
    245.90/339.45 = 147.71/x
  3. Step 3: Cross multiply
    245.90x = 339.45 × 147.71
  4. Step 4: Simplify right side
    245.90x = 50,140.16
  5. Step 5: Solve for x
    x = 50,140.16/245.90
  6. Step 6: Final answer
    x = 203.90

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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.