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Finding the Fourth Proportional to 521.72, 719.93 and 288.85

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Solution

The fourth proportional to 521.72, 719.93 and 288.85 is: 398.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.72 : 719.93 = 288.85 : x
  2. Step 2: Convert to fraction form
    521.72/719.93 = 288.85/x
  3. Step 3: Cross multiply
    521.72x = 719.93 × 288.85
  4. Step 4: Simplify right side
    521.72x = 207,951.78
  5. Step 5: Solve for x
    x = 207,951.78/521.72
  6. Step 6: Final answer
    x = 398.59

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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.