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Finding the Fourth Proportional to 721.65, 996.89 and 557.93

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Solution

The fourth proportional to 721.65, 996.89 and 557.93 is: 770.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.65 : 996.89 = 557.93 : x
  2. Step 2: Convert to fraction form
    721.65/996.89 = 557.93/x
  3. Step 3: Cross multiply
    721.65x = 996.89 × 557.93
  4. Step 4: Simplify right side
    721.65x = 556,194.54
  5. Step 5: Solve for x
    x = 556,194.54/721.65
  6. Step 6: Final answer
    x = 770.72

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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.