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Finding the Fourth Proportional to 900.92, 1,351.49 and 380.84

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Solution

The fourth proportional to 900.92, 1,351.49 and 380.84 is: 571.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.92 : 1,351.49 = 380.84 : x
  2. Step 2: Convert to fraction form
    900.92/1,351.49 = 380.84/x
  3. Step 3: Cross multiply
    900.92x = 1,351.49 × 380.84
  4. Step 4: Simplify right side
    900.92x = 514,692.79
  5. Step 5: Solve for x
    x = 514,692.79/900.92
  6. Step 6: Final answer
    x = 571.30

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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.