Home / 1,243.70-1,865.55-422.90

Finding the Fourth Proportional to 1,243.70, 1,865.55 and 422.90

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Solution

The fourth proportional to 1,243.70, 1,865.55 and 422.90 is: 634.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.70 : 1,865.55 = 422.90 : x
  2. Step 2: Convert to fraction form
    1,243.70/1,865.55 = 422.90/x
  3. Step 3: Cross multiply
    1,243.70x = 1,865.55 × 422.90
  4. Step 4: Simplify right side
    1,243.70x = 788,941.10
  5. Step 5: Solve for x
    x = 788,941.10/1,243.70
  6. Step 6: Final answer
    x = 634.35

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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.