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Finding the Fourth Proportional to 522.66, 721.14 and 312.69

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Solution

The fourth proportional to 522.66, 721.14 and 312.69 is: 431.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.66 : 721.14 = 312.69 : x
  2. Step 2: Convert to fraction form
    522.66/721.14 = 312.69/x
  3. Step 3: Cross multiply
    522.66x = 721.14 × 312.69
  4. Step 4: Simplify right side
    522.66x = 225,493.27
  5. Step 5: Solve for x
    x = 225,493.27/522.66
  6. Step 6: Final answer
    x = 431.43

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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.