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Finding the Fourth Proportional to 479.82, 716.47 and 381.21

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Solution

The fourth proportional to 479.82, 716.47 and 381.21 is: 569.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.82 : 716.47 = 381.21 : x
  2. Step 2: Convert to fraction form
    479.82/716.47 = 381.21/x
  3. Step 3: Cross multiply
    479.82x = 716.47 × 381.21
  4. Step 4: Simplify right side
    479.82x = 273,125.53
  5. Step 5: Solve for x
    x = 273,125.53/479.82
  6. Step 6: Final answer
    x = 569.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.