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Finding the Fourth Proportional to 521.26, 719.36 and 285.22

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Solution

The fourth proportional to 521.26, 719.36 and 285.22 is: 393.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.26 : 719.36 = 285.22 : x
  2. Step 2: Convert to fraction form
    521.26/719.36 = 285.22/x
  3. Step 3: Cross multiply
    521.26x = 719.36 × 285.22
  4. Step 4: Simplify right side
    521.26x = 205,175.86
  5. Step 5: Solve for x
    x = 205,175.86/521.26
  6. Step 6: Final answer
    x = 393.62

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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.