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Finding the Fourth Proportional to 909.49, 1,363.09 and 388.88

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Solution

The fourth proportional to 909.49, 1,363.09 and 388.88 is: 582.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.49 : 1,363.09 = 388.88 : x
  2. Step 2: Convert to fraction form
    909.49/1,363.09 = 388.88/x
  3. Step 3: Cross multiply
    909.49x = 1,363.09 × 388.88
  4. Step 4: Simplify right side
    909.49x = 530,073.48
  5. Step 5: Solve for x
    x = 530,073.48/909.49
  6. Step 6: Final answer
    x = 582.83

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1.5x scale

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.