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Finding the Fourth Proportional to 665.23, 997.45 and 274.78

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Solution

The fourth proportional to 665.23, 997.45 and 274.78 is: 412.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.23 : 997.45 = 274.78 : x
  2. Step 2: Convert to fraction form
    665.23/997.45 = 274.78/x
  3. Step 3: Cross multiply
    665.23x = 997.45 × 274.78
  4. Step 4: Simplify right side
    665.23x = 274,079.63
  5. Step 5: Solve for x
    x = 274,079.63/665.23
  6. Step 6: Final answer
    x = 412.01

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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.