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Finding the Fourth Proportional to 1,685.50, 2,529.34 and 659.50

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Solution

The fourth proportional to 1,685.50, 2,529.34 and 659.50 is: 989.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.50 : 2,529.34 = 659.50 : x
  2. Step 2: Convert to fraction form
    1,685.50/2,529.34 = 659.50/x
  3. Step 3: Cross multiply
    1,685.50x = 2,529.34 × 659.50
  4. Step 4: Simplify right side
    1,685.50x = 1,668,099.73
  5. Step 5: Solve for x
    x = 1,668,099.73/1,685.50
  6. Step 6: Final answer
    x = 989.68

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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.