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Finding the Fourth Proportional to 640.89, 961.80 and 602.61

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Solution

The fourth proportional to 640.89, 961.80 and 602.61 is: 904.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.89 : 961.80 = 602.61 : x
  2. Step 2: Convert to fraction form
    640.89/961.80 = 602.61/x
  3. Step 3: Cross multiply
    640.89x = 961.80 × 602.61
  4. Step 4: Simplify right side
    640.89x = 579,594.24
  5. Step 5: Solve for x
    x = 579,594.24/640.89
  6. Step 6: Final answer
    x = 904.36

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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.