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Finding the Fourth Proportional to 640.74, 962.46 and 459.30

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Solution

The fourth proportional to 640.74, 962.46 and 459.30 is: 689.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.74 : 962.46 = 459.30 : x
  2. Step 2: Convert to fraction form
    640.74/962.46 = 459.30/x
  3. Step 3: Cross multiply
    640.74x = 962.46 × 459.30
  4. Step 4: Simplify right side
    640.74x = 442,057.88
  5. Step 5: Solve for x
    x = 442,057.88/640.74
  6. Step 6: Final answer
    x = 689.92

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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.