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Finding the Fourth Proportional to 909.80, 1,364.45 and 389.54

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Solution

The fourth proportional to 909.80, 1,364.45 and 389.54 is: 584.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.80 : 1,364.45 = 389.54 : x
  2. Step 2: Convert to fraction form
    909.80/1,364.45 = 389.54/x
  3. Step 3: Cross multiply
    909.80x = 1,364.45 × 389.54
  4. Step 4: Simplify right side
    909.80x = 531,505.91
  5. Step 5: Solve for x
    x = 531,505.91/909.80
  6. Step 6: Final answer
    x = 584.20

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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.