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Finding the Fourth Proportional to 640.61, 961.70 and 363.20

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Solution

The fourth proportional to 640.61, 961.70 and 363.20 is: 545.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.61 : 961.70 = 363.20 : x
  2. Step 2: Convert to fraction form
    640.61/961.70 = 363.20/x
  3. Step 3: Cross multiply
    640.61x = 961.70 × 363.20
  4. Step 4: Simplify right side
    640.61x = 349,292.07
  5. Step 5: Solve for x
    x = 349,292.07/640.61
  6. Step 6: Final answer
    x = 545.25

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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.