Home / 1,424.40-2,135.21-693.57

Finding the Fourth Proportional to 1,424.40, 2,135.21 and 693.57

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Solution

The fourth proportional to 1,424.40, 2,135.21 and 693.57 is: 1,039.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,424.40 : 2,135.21 = 693.57 : x
  2. Step 2: Convert to fraction form
    1,424.40/2,135.21 = 693.57/x
  3. Step 3: Cross multiply
    1,424.40x = 2,135.21 × 693.57
  4. Step 4: Simplify right side
    1,424.40x = 1,480,914.13
  5. Step 5: Solve for x
    x = 1,480,914.13/1,424.40
  6. Step 6: Final answer
    x = 1,039.68

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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.