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Finding the Fourth Proportional to 1,591, 2,386.50 and 679

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Solution

The fourth proportional to 1,591, 2,386.50 and 679 is: 1,018.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,591 : 2,386.50 = 679 : x
  2. Step 2: Convert to fraction form
    1,591/2,386.50 = 679/x
  3. Step 3: Cross multiply
    1,591x = 2,386.50 × 679
  4. Step 4: Simplify right side
    1,591x = 1,620,433.50
  5. Step 5: Solve for x
    x = 1,620,433.50/1,591
  6. Step 6: Final answer
    x = 1,018.50

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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.