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Finding the Fourth Proportional to 472.70, 708.28 and 289.71

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Solution

The fourth proportional to 472.70, 708.28 and 289.71 is: 434.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.70 : 708.28 = 289.71 : x
  2. Step 2: Convert to fraction form
    472.70/708.28 = 289.71/x
  3. Step 3: Cross multiply
    472.70x = 708.28 × 289.71
  4. Step 4: Simplify right side
    472.70x = 205,195.07
  5. Step 5: Solve for x
    x = 205,195.07/472.70
  6. Step 6: Final answer
    x = 434.09

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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.