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Finding the Fourth Proportional to 522.82, 721.53 and 289.99

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Solution

The fourth proportional to 522.82, 721.53 and 289.99 is: 400.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.82 : 721.53 = 289.99 : x
  2. Step 2: Convert to fraction form
    522.82/721.53 = 289.99/x
  3. Step 3: Cross multiply
    522.82x = 721.53 × 289.99
  4. Step 4: Simplify right side
    522.82x = 209,236.48
  5. Step 5: Solve for x
    x = 209,236.48/522.82
  6. Step 6: Final answer
    x = 400.21

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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.