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Finding the Fourth Proportional to 1,292.55, 1,938.21 and 676.54

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Solution

The fourth proportional to 1,292.55, 1,938.21 and 676.54 is: 1,014.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.55 : 1,938.21 = 676.54 : x
  2. Step 2: Convert to fraction form
    1,292.55/1,938.21 = 676.54/x
  3. Step 3: Cross multiply
    1,292.55x = 1,938.21 × 676.54
  4. Step 4: Simplify right side
    1,292.55x = 1,311,276.59
  5. Step 5: Solve for x
    x = 1,311,276.59/1,292.55
  6. Step 6: Final answer
    x = 1,014.49

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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.