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Finding the Fourth Proportional to 521.31, 719.42 and 288.44

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Solution

The fourth proportional to 521.31, 719.42 and 288.44 is: 398.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.31 : 719.42 = 288.44 : x
  2. Step 2: Convert to fraction form
    521.31/719.42 = 288.44/x
  3. Step 3: Cross multiply
    521.31x = 719.42 × 288.44
  4. Step 4: Simplify right side
    521.31x = 207,509.50
  5. Step 5: Solve for x
    x = 207,509.50/521.31
  6. Step 6: Final answer
    x = 398.05

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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.