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Finding the Fourth Proportional to 521.73, 719.98 and 288.86

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Solution

The fourth proportional to 521.73, 719.98 and 288.86 is: 398.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.73 : 719.98 = 288.86 : x
  2. Step 2: Convert to fraction form
    521.73/719.98 = 288.86/x
  3. Step 3: Cross multiply
    521.73x = 719.98 × 288.86
  4. Step 4: Simplify right side
    521.73x = 207,969.10
  5. Step 5: Solve for x
    x = 207,969.10/521.73
  6. Step 6: Final answer
    x = 398.61

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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.