Home / 1,638.92-2,260.10-1,390.92

Finding the Fourth Proportional to 1,638.92, 2,260.10 and 1,390.92

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Solution

The fourth proportional to 1,638.92, 2,260.10 and 1,390.92 is: 1,918.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.92 : 2,260.10 = 1,390.92 : x
  2. Step 2: Convert to fraction form
    1,638.92/2,260.10 = 1,390.92/x
  3. Step 3: Cross multiply
    1,638.92x = 2,260.10 × 1,390.92
  4. Step 4: Simplify right side
    1,638.92x = 3,143,618.29
  5. Step 5: Solve for x
    x = 3,143,618.29/1,638.92
  6. Step 6: Final answer
    x = 1,918.10

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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.