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Finding the Fourth Proportional to 522.05, 720.44 and 289.17

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Solution

The fourth proportional to 522.05, 720.44 and 289.17 is: 399.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.05 : 720.44 = 289.17 : x
  2. Step 2: Convert to fraction form
    522.05/720.44 = 289.17/x
  3. Step 3: Cross multiply
    522.05x = 720.44 × 289.17
  4. Step 4: Simplify right side
    522.05x = 208,329.63
  5. Step 5: Solve for x
    x = 208,329.63/522.05
  6. Step 6: Final answer
    x = 399.06

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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.