Home / 1,242.02-1,863.56-420.38

Finding the Fourth Proportional to 1,242.02, 1,863.56 and 420.38

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Solution

The fourth proportional to 1,242.02, 1,863.56 and 420.38 is: 630.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.02 : 1,863.56 = 420.38 : x
  2. Step 2: Convert to fraction form
    1,242.02/1,863.56 = 420.38/x
  3. Step 3: Cross multiply
    1,242.02x = 1,863.56 × 420.38
  4. Step 4: Simplify right side
    1,242.02x = 783,391.93
  5. Step 5: Solve for x
    x = 783,391.93/1,242.02
  6. Step 6: Final answer
    x = 630.74

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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.