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Finding the Fourth Proportional to 1,425.36, 2,137.68 and 399.12

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Solution

The fourth proportional to 1,425.36, 2,137.68 and 399.12 is: 598.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.36 : 2,137.68 = 399.12 : x
  2. Step 2: Convert to fraction form
    1,425.36/2,137.68 = 399.12/x
  3. Step 3: Cross multiply
    1,425.36x = 2,137.68 × 399.12
  4. Step 4: Simplify right side
    1,425.36x = 853,190.84
  5. Step 5: Solve for x
    x = 853,190.84/1,425.36
  6. Step 6: Final answer
    x = 598.58

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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.