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Finding the Fourth Proportional to 633.20, 950.40 and 390.20

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Solution

The fourth proportional to 633.20, 950.40 and 390.20 is: 585.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    633.20 : 950.40 = 390.20 : x
  2. Step 2: Convert to fraction form
    633.20/950.40 = 390.20/x
  3. Step 3: Cross multiply
    633.20x = 950.40 × 390.20
  4. Step 4: Simplify right side
    633.20x = 370,841.33
  5. Step 5: Solve for x
    x = 370,841.33/633.20
  6. Step 6: Final answer
    x = 585.67

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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.