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Finding the Fourth Proportional to 909.15, 1,361.34 and 885.45

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Solution

The fourth proportional to 909.15, 1,361.34 and 885.45 is: 1,325.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.15 : 1,361.34 = 885.45 : x
  2. Step 2: Convert to fraction form
    909.15/1,361.34 = 885.45/x
  3. Step 3: Cross multiply
    909.15x = 1,361.34 × 885.45
  4. Step 4: Simplify right side
    909.15x = 1,205,398.50
  5. Step 5: Solve for x
    x = 1,205,398.50/909.15
  6. Step 6: Final answer
    x = 1,325.85

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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.