Home / 2,122.30-2,928.78-1,178.11

Finding the Fourth Proportional to 2,122.30, 2,928.78 and 1,178.11

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Solution

The fourth proportional to 2,122.30, 2,928.78 and 1,178.11 is: 1,625.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,122.30 : 2,928.78 = 1,178.11 : x
  2. Step 2: Convert to fraction form
    2,122.30/2,928.78 = 1,178.11/x
  3. Step 3: Cross multiply
    2,122.30x = 2,928.78 × 1,178.11
  4. Step 4: Simplify right side
    2,122.30x = 3,450,425.01
  5. Step 5: Solve for x
    x = 3,450,425.01/2,122.30
  6. Step 6: Final answer
    x = 1,625.80

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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.