Home / 1,242.18-1,863.36-420.26

Finding the Fourth Proportional to 1,242.18, 1,863.36 and 420.26

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Solution

The fourth proportional to 1,242.18, 1,863.36 and 420.26 is: 630.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.18 : 1,863.36 = 420.26 : x
  2. Step 2: Convert to fraction form
    1,242.18/1,863.36 = 420.26/x
  3. Step 3: Cross multiply
    1,242.18x = 1,863.36 × 420.26
  4. Step 4: Simplify right side
    1,242.18x = 783,086.36
  5. Step 5: Solve for x
    x = 783,086.36/1,242.18
  6. Step 6: Final answer
    x = 630.41

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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.