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Finding the Fourth Proportional to 1,394.65, 2,091.63 and 407.20

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Solution

The fourth proportional to 1,394.65, 2,091.63 and 407.20 is: 610.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.65 : 2,091.63 = 407.20 : x
  2. Step 2: Convert to fraction form
    1,394.65/2,091.63 = 407.20/x
  3. Step 3: Cross multiply
    1,394.65x = 2,091.63 × 407.20
  4. Step 4: Simplify right side
    1,394.65x = 851,701.28
  5. Step 5: Solve for x
    x = 851,701.28/1,394.65
  6. Step 6: Final answer
    x = 610.69

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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.