Home / 1,890.57-2,836.53-720.66

Finding the Fourth Proportional to 1,890.57, 2,836.53 and 720.66

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Solution

The fourth proportional to 1,890.57, 2,836.53 and 720.66 is: 1,081.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890.57 : 2,836.53 = 720.66 : x
  2. Step 2: Convert to fraction form
    1,890.57/2,836.53 = 720.66/x
  3. Step 3: Cross multiply
    1,890.57x = 2,836.53 × 720.66
  4. Step 4: Simplify right side
    1,890.57x = 2,044,173.71
  5. Step 5: Solve for x
    x = 2,044,173.71/1,890.57
  6. Step 6: Final answer
    x = 1,081.25

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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.