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Finding the Fourth Proportional to 522.41, 720.90 and 312.54

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Solution

The fourth proportional to 522.41, 720.90 and 312.54 is: 431.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.41 : 720.90 = 312.54 : x
  2. Step 2: Convert to fraction form
    522.41/720.90 = 312.54/x
  3. Step 3: Cross multiply
    522.41x = 720.90 × 312.54
  4. Step 4: Simplify right side
    522.41x = 225,311.26
  5. Step 5: Solve for x
    x = 225,311.26/522.41
  6. Step 6: Final answer
    x = 431.29

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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.