Home / 2,817.90-3,887.76-1,638.72

Finding the Fourth Proportional to 2,817.90, 3,887.76 and 1,638.72

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Solution

The fourth proportional to 2,817.90, 3,887.76 and 1,638.72 is: 2,260.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,817.90 : 3,887.76 = 1,638.72 : x
  2. Step 2: Convert to fraction form
    2,817.90/3,887.76 = 1,638.72/x
  3. Step 3: Cross multiply
    2,817.90x = 3,887.76 × 1,638.72
  4. Step 4: Simplify right side
    2,817.90x = 6,370,950.07
  5. Step 5: Solve for x
    x = 6,370,950.07/2,817.90
  6. Step 6: Final answer
    x = 2,260.89

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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.