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Finding the Fourth Proportional to 1,394.66, 2,091.99 and 421.44

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Solution

The fourth proportional to 1,394.66, 2,091.99 and 421.44 is: 632.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.66 : 2,091.99 = 421.44 : x
  2. Step 2: Convert to fraction form
    1,394.66/2,091.99 = 421.44/x
  3. Step 3: Cross multiply
    1,394.66x = 2,091.99 × 421.44
  4. Step 4: Simplify right side
    1,394.66x = 881,646.16
  5. Step 5: Solve for x
    x = 881,646.16/1,394.66
  6. Step 6: Final answer
    x = 632.16

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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.