Home / 1,890.40-2,836.14-720.76

Finding the Fourth Proportional to 1,890.40, 2,836.14 and 720.76

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Solution

The fourth proportional to 1,890.40, 2,836.14 and 720.76 is: 1,081.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890.40 : 2,836.14 = 720.76 : x
  2. Step 2: Convert to fraction form
    1,890.40/2,836.14 = 720.76/x
  3. Step 3: Cross multiply
    1,890.40x = 2,836.14 × 720.76
  4. Step 4: Simplify right side
    1,890.40x = 2,044,176.27
  5. Step 5: Solve for x
    x = 2,044,176.27/1,890.40
  6. Step 6: Final answer
    x = 1,081.35

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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.