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Finding the Fourth Proportional to 1,076.44, 1,613.46 and 426.76

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Solution

The fourth proportional to 1,076.44, 1,613.46 and 426.76 is: 639.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.44 : 1,613.46 = 426.76 : x
  2. Step 2: Convert to fraction form
    1,076.44/1,613.46 = 426.76/x
  3. Step 3: Cross multiply
    1,076.44x = 1,613.46 × 426.76
  4. Step 4: Simplify right side
    1,076.44x = 688,560.19
  5. Step 5: Solve for x
    x = 688,560.19/1,076.44
  6. Step 6: Final answer
    x = 639.66

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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.