Home / 1,291.80-1,938.38-1,222.10

Finding the Fourth Proportional to 1,291.80, 1,938.38 and 1,222.10

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Solution

The fourth proportional to 1,291.80, 1,938.38 and 1,222.10 is: 1,833.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.80 : 1,938.38 = 1,222.10 : x
  2. Step 2: Convert to fraction form
    1,291.80/1,938.38 = 1,222.10/x
  3. Step 3: Cross multiply
    1,291.80x = 1,938.38 × 1,222.10
  4. Step 4: Simplify right side
    1,291.80x = 2,368,878.40
  5. Step 5: Solve for x
    x = 2,368,878.40/1,291.80
  6. Step 6: Final answer
    x = 1,833.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.