Home / 2,817.91-3,888.43-1,638.69

Finding the Fourth Proportional to 2,817.91, 3,888.43 and 1,638.69

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Solution

The fourth proportional to 2,817.91, 3,888.43 and 1,638.69 is: 2,261.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,817.91 : 3,888.43 = 1,638.69 : x
  2. Step 2: Convert to fraction form
    2,817.91/3,888.43 = 1,638.69/x
  3. Step 3: Cross multiply
    2,817.91x = 3,888.43 × 1,638.69
  4. Step 4: Simplify right side
    2,817.91x = 6,371,931.36
  5. Step 5: Solve for x
    x = 6,371,931.36/2,817.91
  6. Step 6: Final answer
    x = 2,261.23

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Half scale
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Double scale
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1.5x scale

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.