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Finding the Fourth Proportional to 423.12, 634.94 and 379.99

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Solution

The fourth proportional to 423.12, 634.94 and 379.99 is: 570.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.12 : 634.94 = 379.99 : x
  2. Step 2: Convert to fraction form
    423.12/634.94 = 379.99/x
  3. Step 3: Cross multiply
    423.12x = 634.94 × 379.99
  4. Step 4: Simplify right side
    423.12x = 241,271.17
  5. Step 5: Solve for x
    x = 241,271.17/423.12
  6. Step 6: Final answer
    x = 570.21

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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.