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Finding the Fourth Proportional to 722.13, 996.53 and 390.56

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Solution

The fourth proportional to 722.13, 996.53 and 390.56 is: 538.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.13 : 996.53 = 390.56 : x
  2. Step 2: Convert to fraction form
    722.13/996.53 = 390.56/x
  3. Step 3: Cross multiply
    722.13x = 996.53 × 390.56
  4. Step 4: Simplify right side
    722.13x = 389,200.75
  5. Step 5: Solve for x
    x = 389,200.75/722.13
  6. Step 6: Final answer
    x = 538.96

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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.