Home / 2,815.31-3,885-1,636.29

Finding the Fourth Proportional to 2,815.31, 3,885 and 1,636.29

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Solution

The fourth proportional to 2,815.31, 3,885 and 1,636.29 is: 2,258.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.31 : 3,885 = 1,636.29 : x
  2. Step 2: Convert to fraction form
    2,815.31/3,885 = 1,636.29/x
  3. Step 3: Cross multiply
    2,815.31x = 3,885 × 1,636.29
  4. Step 4: Simplify right side
    2,815.31x = 6,356,986.65
  5. Step 5: Solve for x
    x = 6,356,986.65/2,815.31
  6. Step 6: Final answer
    x = 2,258.01

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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.