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Finding the Fourth Proportional to 472.85, 708.50 and 287.79

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Solution

The fourth proportional to 472.85, 708.50 and 287.79 is: 431.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.85 : 708.50 = 287.79 : x
  2. Step 2: Convert to fraction form
    472.85/708.50 = 287.79/x
  3. Step 3: Cross multiply
    472.85x = 708.50 × 287.79
  4. Step 4: Simplify right side
    472.85x = 203,897.78
  5. Step 5: Solve for x
    x = 203,897.78/472.85
  6. Step 6: Final answer
    x = 431.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.