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Finding the Fourth Proportional to 909.12, 1,363.73 and 292.78

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Solution

The fourth proportional to 909.12, 1,363.73 and 292.78 is: 439.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.12 : 1,363.73 = 292.78 : x
  2. Step 2: Convert to fraction form
    909.12/1,363.73 = 292.78/x
  3. Step 3: Cross multiply
    909.12x = 1,363.73 × 292.78
  4. Step 4: Simplify right side
    909.12x = 399,272.87
  5. Step 5: Solve for x
    x = 399,272.87/909.12
  6. Step 6: Final answer
    x = 439.19

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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.