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Finding the Fourth Proportional to 383.79, 575.69 and 109.90

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Solution

The fourth proportional to 383.79, 575.69 and 109.90 is: 164.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.79 : 575.69 = 109.90 : x
  2. Step 2: Convert to fraction form
    383.79/575.69 = 109.90/x
  3. Step 3: Cross multiply
    383.79x = 575.69 × 109.90
  4. Step 4: Simplify right side
    383.79x = 63,266.34
  5. Step 5: Solve for x
    x = 63,266.34/383.79
  6. Step 6: Final answer
    x = 164.85

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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.