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Finding the Fourth Proportional to 722.65, 997.24 and 407.91

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Solution

The fourth proportional to 722.65, 997.24 and 407.91 is: 562.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.65 : 997.24 = 407.91 : x
  2. Step 2: Convert to fraction form
    722.65/997.24 = 407.91/x
  3. Step 3: Cross multiply
    722.65x = 997.24 × 407.91
  4. Step 4: Simplify right side
    722.65x = 406,784.17
  5. Step 5: Solve for x
    x = 406,784.17/722.65
  6. Step 6: Final answer
    x = 562.91

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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.