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Finding the Fourth Proportional to 1,264.38, 1,896.50 and 398.63

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Solution

The fourth proportional to 1,264.38, 1,896.50 and 398.63 is: 597.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,264.38 : 1,896.50 = 398.63 : x
  2. Step 2: Convert to fraction form
    1,264.38/1,896.50 = 398.63/x
  3. Step 3: Cross multiply
    1,264.38x = 1,896.50 × 398.63
  4. Step 4: Simplify right side
    1,264.38x = 755,990.32
  5. Step 5: Solve for x
    x = 755,990.32/1,264.38
  6. Step 6: Final answer
    x = 597.91

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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.