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Finding the Third Proportional to 1,539.75 and 2,779.50

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Solution

The third proportional to 1,539.75 and 2,779.50 is: 5,017.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.75 : 2,779.50 = 2,779.50 : x
  2. Step 2: Convert to fraction form
    1,539.75/2,779.50 = 2,779.50/x
  3. Step 3: Cross multiply
    1,539.75x = 2,779.50 × 2,779.50
  4. Step 4: Simplify right side
    1,539.75x = 7,725,620.25
  5. Step 5: Solve for x
    x = 7,725,620.25/1,539.75
  6. Step 6: Final answer
    x = 5,017.45

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Why These Related Problems?

These problems maintain the same ratio (1.81) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.