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Finding the Fourth Proportional to 633.90, 949.80 and 389.91

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Solution

The fourth proportional to 633.90, 949.80 and 389.91 is: 584.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    633.90 : 949.80 = 389.91 : x
  2. Step 2: Convert to fraction form
    633.90/949.80 = 389.91/x
  3. Step 3: Cross multiply
    633.90x = 949.80 × 389.91
  4. Step 4: Simplify right side
    633.90x = 370,331.77
  5. Step 5: Solve for x
    x = 370,331.77/633.90
  6. Step 6: Final answer
    x = 584.22

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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.