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Finding the Fourth Proportional to 245.78, 339.20 and 135.28

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Solution

The fourth proportional to 245.78, 339.20 and 135.28 is: 186.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.78 : 339.20 = 135.28 : x
  2. Step 2: Convert to fraction form
    245.78/339.20 = 135.28/x
  3. Step 3: Cross multiply
    245.78x = 339.20 × 135.28
  4. Step 4: Simplify right side
    245.78x = 45,886.98
  5. Step 5: Solve for x
    x = 45,886.98/245.78
  6. Step 6: Final answer
    x = 186.70

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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.