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Finding the Fourth Proportional to 383.86, 575.86 and 140.46

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Solution

The fourth proportional to 383.86, 575.86 and 140.46 is: 210.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.86 : 575.86 = 140.46 : x
  2. Step 2: Convert to fraction form
    383.86/575.86 = 140.46/x
  3. Step 3: Cross multiply
    383.86x = 575.86 × 140.46
  4. Step 4: Simplify right side
    383.86x = 80,885.30
  5. Step 5: Solve for x
    x = 80,885.30/383.86
  6. Step 6: Final answer
    x = 210.72

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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.