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Finding the Fourth Proportional to 1,142.21, 1,576.23 and 676.46

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Solution

The fourth proportional to 1,142.21, 1,576.23 and 676.46 is: 933.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.21 : 1,576.23 = 676.46 : x
  2. Step 2: Convert to fraction form
    1,142.21/1,576.23 = 676.46/x
  3. Step 3: Cross multiply
    1,142.21x = 1,576.23 × 676.46
  4. Step 4: Simplify right side
    1,142.21x = 1,066,257.95
  5. Step 5: Solve for x
    x = 1,066,257.95/1,142.21
  6. Step 6: Final answer
    x = 933.50

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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.