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Finding the Fourth Proportional to 676.20, 1,013.66 and 387.08

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Solution

The fourth proportional to 676.20, 1,013.66 and 387.08 is: 580.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.20 : 1,013.66 = 387.08 : x
  2. Step 2: Convert to fraction form
    676.20/1,013.66 = 387.08/x
  3. Step 3: Cross multiply
    676.20x = 1,013.66 × 387.08
  4. Step 4: Simplify right side
    676.20x = 392,367.51
  5. Step 5: Solve for x
    x = 392,367.51/676.20
  6. Step 6: Final answer
    x = 580.25

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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.