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Finding the Fourth Proportional to 676.08, 1,013.31 and 280.40

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Solution

The fourth proportional to 676.08, 1,013.31 and 280.40 is: 420.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.08 : 1,013.31 = 280.40 : x
  2. Step 2: Convert to fraction form
    676.08/1,013.31 = 280.40/x
  3. Step 3: Cross multiply
    676.08x = 1,013.31 × 280.40
  4. Step 4: Simplify right side
    676.08x = 284,127.06
  5. Step 5: Solve for x
    x = 284,127.06/676.08
  6. Step 6: Final answer
    x = 420.26

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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.