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Finding the Fourth Proportional to 522.48, 721.04 and 289.61

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Solution

The fourth proportional to 522.48, 721.04 and 289.61 is: 399.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.48 : 721.04 = 289.61 : x
  2. Step 2: Convert to fraction form
    522.48/721.04 = 289.61/x
  3. Step 3: Cross multiply
    522.48x = 721.04 × 289.61
  4. Step 4: Simplify right side
    522.48x = 208,818.05
  5. Step 5: Solve for x
    x = 208,818.05/522.48
  6. Step 6: Final answer
    x = 399.66

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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.