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Finding the Fourth Proportional to 909.72, 1,365 and 447.48

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Solution

The fourth proportional to 909.72, 1,365 and 447.48 is: 671.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.72 : 1,365 = 447.48 : x
  2. Step 2: Convert to fraction form
    909.72/1,365 = 447.48/x
  3. Step 3: Cross multiply
    909.72x = 1,365 × 447.48
  4. Step 4: Simplify right side
    909.72x = 610,810.20
  5. Step 5: Solve for x
    x = 610,810.20/909.72
  6. Step 6: Final answer
    x = 671.43

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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.