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Finding the Fourth Proportional to 1,659.95, 2,489.93 and 685.52

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Solution

The fourth proportional to 1,659.95, 2,489.93 and 685.52 is: 1,028.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.95 : 2,489.93 = 685.52 : x
  2. Step 2: Convert to fraction form
    1,659.95/2,489.93 = 685.52/x
  3. Step 3: Cross multiply
    1,659.95x = 2,489.93 × 685.52
  4. Step 4: Simplify right side
    1,659.95x = 1,706,896.81
  5. Step 5: Solve for x
    x = 1,706,896.81/1,659.95
  6. Step 6: Final answer
    x = 1,028.28

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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.