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Finding the Fourth Proportional to 2,390.80, 3,586.20 and 659.44

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Solution

The fourth proportional to 2,390.80, 3,586.20 and 659.44 is: 989.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,390.80 : 3,586.20 = 659.44 : x
  2. Step 2: Convert to fraction form
    2,390.80/3,586.20 = 659.44/x
  3. Step 3: Cross multiply
    2,390.80x = 3,586.20 × 659.44
  4. Step 4: Simplify right side
    2,390.80x = 2,364,883.73
  5. Step 5: Solve for x
    x = 2,364,883.73/2,390.80
  6. Step 6: Final answer
    x = 989.16

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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.