Home / 2,120.15-2,925.79-1,188.65

Finding the Fourth Proportional to 2,120.15, 2,925.79 and 1,188.65

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Solution

The fourth proportional to 2,120.15, 2,925.79 and 1,188.65 is: 1,640.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.15 : 2,925.79 = 1,188.65 : x
  2. Step 2: Convert to fraction form
    2,120.15/2,925.79 = 1,188.65/x
  3. Step 3: Cross multiply
    2,120.15x = 2,925.79 × 1,188.65
  4. Step 4: Simplify right side
    2,120.15x = 3,477,725.65
  5. Step 5: Solve for x
    x = 3,477,725.65/2,120.15
  6. Step 6: Final answer
    x = 1,640.32

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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.