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Finding the Fourth Proportional to 522.43, 720.89 and 289.55

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Solution

The fourth proportional to 522.43, 720.89 and 289.55 is: 399.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.43 : 720.89 = 289.55 : x
  2. Step 2: Convert to fraction form
    522.43/720.89 = 289.55/x
  3. Step 3: Cross multiply
    522.43x = 720.89 × 289.55
  4. Step 4: Simplify right side
    522.43x = 208,734.05
  5. Step 5: Solve for x
    x = 208,734.05/522.43
  6. Step 6: Final answer
    x = 399.55

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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.