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Finding the Fourth Proportional to 909.19, 1,364.93 and 447.42

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Solution

The fourth proportional to 909.19, 1,364.93 and 447.42 is: 671.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.19 : 1,364.93 = 447.42 : x
  2. Step 2: Convert to fraction form
    909.19/1,364.93 = 447.42/x
  3. Step 3: Cross multiply
    909.19x = 1,364.93 × 447.42
  4. Step 4: Simplify right side
    909.19x = 610,696.98
  5. Step 5: Solve for x
    x = 610,696.98/909.19
  6. Step 6: Final answer
    x = 671.69

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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.