Home / 1,394.12-2,091.51-420.23

Finding the Fourth Proportional to 1,394.12, 2,091.51 and 420.23

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Solution

The fourth proportional to 1,394.12, 2,091.51 and 420.23 is: 630.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.12 : 2,091.51 = 420.23 : x
  2. Step 2: Convert to fraction form
    1,394.12/2,091.51 = 420.23/x
  3. Step 3: Cross multiply
    1,394.12x = 2,091.51 × 420.23
  4. Step 4: Simplify right side
    1,394.12x = 878,904.79
  5. Step 5: Solve for x
    x = 878,904.79/1,394.12
  6. Step 6: Final answer
    x = 630.44

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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.