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Finding the Fourth Proportional to 522.44, 720.85 and 312.58

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Solution

The fourth proportional to 522.44, 720.85 and 312.58 is: 431.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.44 : 720.85 = 312.58 : x
  2. Step 2: Convert to fraction form
    522.44/720.85 = 312.58/x
  3. Step 3: Cross multiply
    522.44x = 720.85 × 312.58
  4. Step 4: Simplify right side
    522.44x = 225,320.71
  5. Step 5: Solve for x
    x = 225,320.71/522.44
  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.