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Finding the Fourth Proportional to 665.10, 997.20 and 340.74

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Solution

The fourth proportional to 665.10, 997.20 and 340.74 is: 510.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.10 : 997.20 = 340.74 : x
  2. Step 2: Convert to fraction form
    665.10/997.20 = 340.74/x
  3. Step 3: Cross multiply
    665.10x = 997.20 × 340.74
  4. Step 4: Simplify right side
    665.10x = 339,785.93
  5. Step 5: Solve for x
    x = 339,785.93/665.10
  6. Step 6: Final answer
    x = 510.88

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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.