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Finding the Fourth Proportional to 676.94, 1,013.78 and 387.50

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Solution

The fourth proportional to 676.94, 1,013.78 and 387.50 is: 580.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.94 : 1,013.78 = 387.50 : x
  2. Step 2: Convert to fraction form
    676.94/1,013.78 = 387.50/x
  3. Step 3: Cross multiply
    676.94x = 1,013.78 × 387.50
  4. Step 4: Simplify right side
    676.94x = 392,839.75
  5. Step 5: Solve for x
    x = 392,839.75/676.94
  6. Step 6: Final answer
    x = 580.32

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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.