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Finding the Fourth Proportional to 2,813.94, 4,220.91 and 865.69

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Solution

The fourth proportional to 2,813.94, 4,220.91 and 865.69 is: 1,298.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,813.94 : 4,220.91 = 865.69 : x
  2. Step 2: Convert to fraction form
    2,813.94/4,220.91 = 865.69/x
  3. Step 3: Cross multiply
    2,813.94x = 4,220.91 × 865.69
  4. Step 4: Simplify right side
    2,813.94x = 3,653,989.03
  5. Step 5: Solve for x
    x = 3,653,989.03/2,813.94
  6. Step 6: Final answer
    x = 1,298.53

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1.5x scale

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.