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Finding the Fourth Proportional to 665.78, 999.15 and 249.69

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Solution

The fourth proportional to 665.78, 999.15 and 249.69 is: 374.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.78 : 999.15 = 249.69 : x
  2. Step 2: Convert to fraction form
    665.78/999.15 = 249.69/x
  3. Step 3: Cross multiply
    665.78x = 999.15 × 249.69
  4. Step 4: Simplify right side
    665.78x = 249,477.76
  5. Step 5: Solve for x
    x = 249,477.76/665.78
  6. Step 6: Final answer
    x = 374.72

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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.