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Finding the Fourth Proportional to 259.90, 390.09 and 178.54

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Solution

The fourth proportional to 259.90, 390.09 and 178.54 is: 267.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.90 : 390.09 = 178.54 : x
  2. Step 2: Convert to fraction form
    259.90/390.09 = 178.54/x
  3. Step 3: Cross multiply
    259.90x = 390.09 × 178.54
  4. Step 4: Simplify right side
    259.90x = 69,646.67
  5. Step 5: Solve for x
    x = 69,646.67/259.90
  6. Step 6: Final answer
    x = 267.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.