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Finding the Fourth Proportional to 522.81, 721.49 and 289.94

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Solution

The fourth proportional to 522.81, 721.49 and 289.94 is: 400.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.81 : 721.49 = 289.94 : x
  2. Step 2: Convert to fraction form
    522.81/721.49 = 289.94/x
  3. Step 3: Cross multiply
    522.81x = 721.49 × 289.94
  4. Step 4: Simplify right side
    522.81x = 209,188.81
  5. Step 5: Solve for x
    x = 209,188.81/522.81
  6. Step 6: Final answer
    x = 400.12

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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.