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Finding the Fourth Proportional to 1,739.21, 2,608.81 and 643.68

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Solution

The fourth proportional to 1,739.21, 2,608.81 and 643.68 is: 965.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,739.21 : 2,608.81 = 643.68 : x
  2. Step 2: Convert to fraction form
    1,739.21/2,608.81 = 643.68/x
  3. Step 3: Cross multiply
    1,739.21x = 2,608.81 × 643.68
  4. Step 4: Simplify right side
    1,739.21x = 1,679,237.21
  5. Step 5: Solve for x
    x = 1,679,237.21/1,739.21
  6. Step 6: Final answer
    x = 965.52

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1.5x scale

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.