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Finding the Fourth Proportional to 472.17, 707.30 and 215.85

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Solution

The fourth proportional to 472.17, 707.30 and 215.85 is: 323.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.17 : 707.30 = 215.85 : x
  2. Step 2: Convert to fraction form
    472.17/707.30 = 215.85/x
  3. Step 3: Cross multiply
    472.17x = 707.30 × 215.85
  4. Step 4: Simplify right side
    472.17x = 152,669.63
  5. Step 5: Solve for x
    x = 152,669.63/472.17
  6. Step 6: Final answer
    x = 323.34

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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.