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Finding the Fourth Proportional to 499.73, 689.74 and 322.57

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Solution

The fourth proportional to 499.73, 689.74 and 322.57 is: 445.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.73 : 689.74 = 322.57 : x
  2. Step 2: Convert to fraction form
    499.73/689.74 = 322.57/x
  3. Step 3: Cross multiply
    499.73x = 689.74 × 322.57
  4. Step 4: Simplify right side
    499.73x = 222,486.90
  5. Step 5: Solve for x
    x = 222,486.90/499.73
  6. Step 6: Final answer
    x = 445.21

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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.