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Finding the Fourth Proportional to 1,659.45, 2,489.90 and 685.77

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Solution

The fourth proportional to 1,659.45, 2,489.90 and 685.77 is: 1,028.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.45 : 2,489.90 = 685.77 : x
  2. Step 2: Convert to fraction form
    1,659.45/2,489.90 = 685.77/x
  3. Step 3: Cross multiply
    1,659.45x = 2,489.90 × 685.77
  4. Step 4: Simplify right side
    1,659.45x = 1,707,495.29
  5. Step 5: Solve for x
    x = 1,707,495.29/1,659.45
  6. Step 6: Final answer
    x = 1,028.95

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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.