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Finding the Fourth Proportional to 676.90, 1,012.95 and 619.30

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Solution

The fourth proportional to 676.90, 1,012.95 and 619.30 is: 926.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.90 : 1,012.95 = 619.30 : x
  2. Step 2: Convert to fraction form
    676.90/1,012.95 = 619.30/x
  3. Step 3: Cross multiply
    676.90x = 1,012.95 × 619.30
  4. Step 4: Simplify right side
    676.90x = 627,319.94
  5. Step 5: Solve for x
    x = 627,319.94/676.90
  6. Step 6: Final answer
    x = 926.75

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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.