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Finding the Fourth Proportional to 1,029.20, 1,421.16 and 681.44

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Solution

The fourth proportional to 1,029.20, 1,421.16 and 681.44 is: 940.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.20 : 1,421.16 = 681.44 : x
  2. Step 2: Convert to fraction form
    1,029.20/1,421.16 = 681.44/x
  3. Step 3: Cross multiply
    1,029.20x = 1,421.16 × 681.44
  4. Step 4: Simplify right side
    1,029.20x = 968,435.27
  5. Step 5: Solve for x
    x = 968,435.27/1,029.20
  6. Step 6: Final answer
    x = 940.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.