Home / 1,029.28-1,419.58-869.20

Finding the Fourth Proportional to 1,029.28, 1,419.58 and 869.20

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Solution

The fourth proportional to 1,029.28, 1,419.58 and 869.20 is: 1,198.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.28 : 1,419.58 = 869.20 : x
  2. Step 2: Convert to fraction form
    1,029.28/1,419.58 = 869.20/x
  3. Step 3: Cross multiply
    1,029.28x = 1,419.58 × 869.20
  4. Step 4: Simplify right side
    1,029.28x = 1,233,898.94
  5. Step 5: Solve for x
    x = 1,233,898.94/1,029.28
  6. Step 6: Final answer
    x = 1,198.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.