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Finding the Fourth Proportional to 1,265.21, 1,897.91 and 399.50

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Solution

The fourth proportional to 1,265.21, 1,897.91 and 399.50 is: 599.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.21 : 1,897.91 = 399.50 : x
  2. Step 2: Convert to fraction form
    1,265.21/1,897.91 = 399.50/x
  3. Step 3: Cross multiply
    1,265.21x = 1,897.91 × 399.50
  4. Step 4: Simplify right side
    1,265.21x = 758,215.05
  5. Step 5: Solve for x
    x = 758,215.05/1,265.21
  6. Step 6: Final answer
    x = 599.28

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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.