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Finding the Fourth Proportional to 472.80, 709.56 and 405.12

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Solution

The fourth proportional to 472.80, 709.56 and 405.12 is: 607.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.80 : 709.56 = 405.12 : x
  2. Step 2: Convert to fraction form
    472.80/709.56 = 405.12/x
  3. Step 3: Cross multiply
    472.80x = 709.56 × 405.12
  4. Step 4: Simplify right side
    472.80x = 287,456.95
  5. Step 5: Solve for x
    x = 287,456.95/472.80
  6. Step 6: Final answer
    x = 607.99

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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.