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Finding the Fourth Proportional to 1,352.40, 2,028.50 and 427.99

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Solution

The fourth proportional to 1,352.40, 2,028.50 and 427.99 is: 641.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,352.40 : 2,028.50 = 427.99 : x
  2. Step 2: Convert to fraction form
    1,352.40/2,028.50 = 427.99/x
  3. Step 3: Cross multiply
    1,352.40x = 2,028.50 × 427.99
  4. Step 4: Simplify right side
    1,352.40x = 868,177.72
  5. Step 5: Solve for x
    x = 868,177.72/1,352.40
  6. Step 6: Final answer
    x = 641.95

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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.