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Finding the Fourth Proportional to 647.43, 971.34 and 214.59

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Solution

The fourth proportional to 647.43, 971.34 and 214.59 is: 321.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.43 : 971.34 = 214.59 : x
  2. Step 2: Convert to fraction form
    647.43/971.34 = 214.59/x
  3. Step 3: Cross multiply
    647.43x = 971.34 × 214.59
  4. Step 4: Simplify right side
    647.43x = 208,439.85
  5. Step 5: Solve for x
    x = 208,439.85/647.43
  6. Step 6: Final answer
    x = 321.95

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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.