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Finding the Fourth Proportional to 383.16, 575.34 and 318.78

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Solution

The fourth proportional to 383.16, 575.34 and 318.78 is: 478.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.16 : 575.34 = 318.78 : x
  2. Step 2: Convert to fraction form
    383.16/575.34 = 318.78/x
  3. Step 3: Cross multiply
    383.16x = 575.34 × 318.78
  4. Step 4: Simplify right side
    383.16x = 183,406.89
  5. Step 5: Solve for x
    x = 183,406.89/383.16
  6. Step 6: Final answer
    x = 478.67

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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.