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Finding the Fourth Proportional to 383.60, 575.40 and 109.69

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Solution

The fourth proportional to 383.60, 575.40 and 109.69 is: 164.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.60 : 575.40 = 109.69 : x
  2. Step 2: Convert to fraction form
    383.60/575.40 = 109.69/x
  3. Step 3: Cross multiply
    383.60x = 575.40 × 109.69
  4. Step 4: Simplify right side
    383.60x = 63,117.68
  5. Step 5: Solve for x
    x = 63,117.68/383.60
  6. Step 6: Final answer
    x = 164.54

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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.