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Finding the Fourth Proportional to 1,424.39, 2,136.80 and 693.47

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Solution

The fourth proportional to 1,424.39, 2,136.80 and 693.47 is: 1,040.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,424.39 : 2,136.80 = 693.47 : x
  2. Step 2: Convert to fraction form
    1,424.39/2,136.80 = 693.47/x
  3. Step 3: Cross multiply
    1,424.39x = 2,136.80 × 693.47
  4. Step 4: Simplify right side
    1,424.39x = 1,481,808.57
  5. Step 5: Solve for x
    x = 1,481,808.57/1,424.39
  6. Step 6: Final answer
    x = 1,040.31

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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.