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Finding the Fourth Proportional to 522.70, 721.38 and 289.87

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Solution

The fourth proportional to 522.70, 721.38 and 289.87 is: 400.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.70 : 721.38 = 289.87 : x
  2. Step 2: Convert to fraction form
    522.70/721.38 = 289.87/x
  3. Step 3: Cross multiply
    522.70x = 721.38 × 289.87
  4. Step 4: Simplify right side
    522.70x = 209,108.13
  5. Step 5: Solve for x
    x = 209,108.13/522.70
  6. Step 6: Final answer
    x = 400.05

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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.