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Finding the Fourth Proportional to 1,424.31, 2,136.47 and 398.31

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Solution

The fourth proportional to 1,424.31, 2,136.47 and 398.31 is: 597.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,424.31 : 2,136.47 = 398.31 : x
  2. Step 2: Convert to fraction form
    1,424.31/2,136.47 = 398.31/x
  3. Step 3: Cross multiply
    1,424.31x = 2,136.47 × 398.31
  4. Step 4: Simplify right side
    1,424.31x = 850,977.37
  5. Step 5: Solve for x
    x = 850,977.37/1,424.31
  6. Step 6: Final answer
    x = 597.47

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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.