Home / 1,786.40-2,679.36-487.96

Finding the Fourth Proportional to 1,786.40, 2,679.36 and 487.96

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Solution

The fourth proportional to 1,786.40, 2,679.36 and 487.96 is: 731.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.40 : 2,679.36 = 487.96 : x
  2. Step 2: Convert to fraction form
    1,786.40/2,679.36 = 487.96/x
  3. Step 3: Cross multiply
    1,786.40x = 2,679.36 × 487.96
  4. Step 4: Simplify right side
    1,786.40x = 1,307,420.51
  5. Step 5: Solve for x
    x = 1,307,420.51/1,786.40
  6. Step 6: Final answer
    x = 731.87

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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.