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Finding the Fourth Proportional to 1,292.52, 1,938.12 and 676.56

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Solution

The fourth proportional to 1,292.52, 1,938.12 and 676.56 is: 1,014.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.52 : 1,938.12 = 676.56 : x
  2. Step 2: Convert to fraction form
    1,292.52/1,938.12 = 676.56/x
  3. Step 3: Cross multiply
    1,292.52x = 1,938.12 × 676.56
  4. Step 4: Simplify right side
    1,292.52x = 1,311,254.47
  5. Step 5: Solve for x
    x = 1,311,254.47/1,292.52
  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.