Home / 3,109.79-4,291.79-1,915.04

Finding the Fourth Proportional to 3,109.79, 4,291.79 and 1,915.04

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Solution

The fourth proportional to 3,109.79, 4,291.79 and 1,915.04 is: 2,642.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.79 : 4,291.79 = 1,915.04 : x
  2. Step 2: Convert to fraction form
    3,109.79/4,291.79 = 1,915.04/x
  3. Step 3: Cross multiply
    3,109.79x = 4,291.79 × 1,915.04
  4. Step 4: Simplify right side
    3,109.79x = 8,218,950.68
  5. Step 5: Solve for x
    x = 8,218,950.68/3,109.79
  6. Step 6: Final answer
    x = 2,642.93

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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.