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Finding the Fourth Proportional to 288.78, 398.70 and 178.36

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Solution

The fourth proportional to 288.78, 398.70 and 178.36 is: 246.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.78 : 398.70 = 178.36 : x
  2. Step 2: Convert to fraction form
    288.78/398.70 = 178.36/x
  3. Step 3: Cross multiply
    288.78x = 398.70 × 178.36
  4. Step 4: Simplify right side
    288.78x = 71,112.13
  5. Step 5: Solve for x
    x = 71,112.13/288.78
  6. Step 6: Final answer
    x = 246.25

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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.