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Finding the Fourth Proportional to 245.56, 338.87 and 147.31

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Solution

The fourth proportional to 245.56, 338.87 and 147.31 is: 203.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.56 : 338.87 = 147.31 : x
  2. Step 2: Convert to fraction form
    245.56/338.87 = 147.31/x
  3. Step 3: Cross multiply
    245.56x = 338.87 × 147.31
  4. Step 4: Simplify right side
    245.56x = 49,916.51
  5. Step 5: Solve for x
    x = 49,916.51/245.56
  6. Step 6: Final answer
    x = 203.28

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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.