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Finding the Fourth Proportional to 553.85, 830.84 and 380.91

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Solution

The fourth proportional to 553.85, 830.84 and 380.91 is: 571.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.85 : 830.84 = 380.91 : x
  2. Step 2: Convert to fraction form
    553.85/830.84 = 380.91/x
  3. Step 3: Cross multiply
    553.85x = 830.84 × 380.91
  4. Step 4: Simplify right side
    553.85x = 316,473.36
  5. Step 5: Solve for x
    x = 316,473.36/553.85
  6. Step 6: Final answer
    x = 571.41

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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.