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Finding the Fourth Proportional to 722.40, 996.82 and 407.61

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Solution

The fourth proportional to 722.40, 996.82 and 407.61 is: 562.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.40 : 996.82 = 407.61 : x
  2. Step 2: Convert to fraction form
    722.40/996.82 = 407.61/x
  3. Step 3: Cross multiply
    722.40x = 996.82 × 407.61
  4. Step 4: Simplify right side
    722.40x = 406,313.80
  5. Step 5: Solve for x
    x = 406,313.80/722.40
  6. Step 6: Final answer
    x = 562.45

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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.