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Finding the Fourth Proportional to 522.55, 721.11 and 289.67

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Solution

The fourth proportional to 522.55, 721.11 and 289.67 is: 399.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.55 : 721.11 = 289.67 : x
  2. Step 2: Convert to fraction form
    522.55/721.11 = 289.67/x
  3. Step 3: Cross multiply
    522.55x = 721.11 × 289.67
  4. Step 4: Simplify right side
    522.55x = 208,883.93
  5. Step 5: Solve for x
    x = 208,883.93/522.55
  6. Step 6: Final answer
    x = 399.74

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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.