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Finding the Fourth Proportional to 2,390.92, 3,586.20 and 659.68

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Solution

The fourth proportional to 2,390.92, 3,586.20 and 659.68 is: 989.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,390.92 : 3,586.20 = 659.68 : x
  2. Step 2: Convert to fraction form
    2,390.92/3,586.20 = 659.68/x
  3. Step 3: Cross multiply
    2,390.92x = 3,586.20 × 659.68
  4. Step 4: Simplify right side
    2,390.92x = 2,365,744.42
  5. Step 5: Solve for x
    x = 2,365,744.42/2,390.92
  6. Step 6: Final answer
    x = 989.47

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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.