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Finding the Fourth Proportional to 463.64, 640.40 and 345.78

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Solution

The fourth proportional to 463.64, 640.40 and 345.78 is: 477.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.64 : 640.40 = 345.78 : x
  2. Step 2: Convert to fraction form
    463.64/640.40 = 345.78/x
  3. Step 3: Cross multiply
    463.64x = 640.40 × 345.78
  4. Step 4: Simplify right side
    463.64x = 221,435.78
  5. Step 5: Solve for x
    x = 221,435.78/463.64
  6. Step 6: Final answer
    x = 477.61

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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.