Home / 2,121-2,926.98-1,189.80

Finding the Fourth Proportional to 2,121, 2,926.98 and 1,189.80

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Solution

The fourth proportional to 2,121, 2,926.98 and 1,189.80 is: 1,641.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121 : 2,926.98 = 1,189.80 : x
  2. Step 2: Convert to fraction form
    2,121/2,926.98 = 1,189.80/x
  3. Step 3: Cross multiply
    2,121x = 2,926.98 × 1,189.80
  4. Step 4: Simplify right side
    2,121x = 3,482,520.80
  5. Step 5: Solve for x
    x = 3,482,520.80/2,121
  6. Step 6: Final answer
    x = 1,641.92

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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.