Home / 1,412.21-2,118.61-487.81

Finding the Fourth Proportional to 1,412.21, 2,118.61 and 487.81

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Solution

The fourth proportional to 1,412.21, 2,118.61 and 487.81 is: 731.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.21 : 2,118.61 = 487.81 : x
  2. Step 2: Convert to fraction form
    1,412.21/2,118.61 = 487.81/x
  3. Step 3: Cross multiply
    1,412.21x = 2,118.61 × 487.81
  4. Step 4: Simplify right side
    1,412.21x = 1,033,472.63
  5. Step 5: Solve for x
    x = 1,033,472.63/1,412.21
  6. Step 6: Final answer
    x = 731.81

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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.