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Finding the Fourth Proportional to 908.79, 1,363.61 and 447.04

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Solution

The fourth proportional to 908.79, 1,363.61 and 447.04 is: 670.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.79 : 1,363.61 = 447.04 : x
  2. Step 2: Convert to fraction form
    908.79/1,363.61 = 447.04/x
  3. Step 3: Cross multiply
    908.79x = 1,363.61 × 447.04
  4. Step 4: Simplify right side
    908.79x = 609,588.21
  5. Step 5: Solve for x
    x = 609,588.21/908.79
  6. Step 6: Final answer
    x = 670.77

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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.