Home / 2,156.78-3,218.49-1,923.80

Finding the Fourth Proportional to 2,156.78, 3,218.49 and 1,923.80

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Solution

The fourth proportional to 2,156.78, 3,218.49 and 1,923.80 is: 2,870.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,156.78 : 3,218.49 = 1,923.80 : x
  2. Step 2: Convert to fraction form
    2,156.78/3,218.49 = 1,923.80/x
  3. Step 3: Cross multiply
    2,156.78x = 3,218.49 × 1,923.80
  4. Step 4: Simplify right side
    2,156.78x = 6,191,731.06
  5. Step 5: Solve for x
    x = 6,191,731.06/2,156.78
  6. Step 6: Final answer
    x = 2,870.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.