Home / 2,120-2,925.64-1,188.56

Finding the Fourth Proportional to 2,120, 2,925.64 and 1,188.56

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Solution

The fourth proportional to 2,120, 2,925.64 and 1,188.56 is: 1,640.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120 : 2,925.64 = 1,188.56 : x
  2. Step 2: Convert to fraction form
    2,120/2,925.64 = 1,188.56/x
  3. Step 3: Cross multiply
    2,120x = 2,925.64 × 1,188.56
  4. Step 4: Simplify right side
    2,120x = 3,477,298.68
  5. Step 5: Solve for x
    x = 3,477,298.68/2,120
  6. Step 6: Final answer
    x = 1,640.24

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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.