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Finding the Fourth Proportional to 2,159.84, 3,237.32 and 859.80

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Solution

The fourth proportional to 2,159.84, 3,237.32 and 859.80 is: 1,288.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.84 : 3,237.32 = 859.80 : x
  2. Step 2: Convert to fraction form
    2,159.84/3,237.32 = 859.80/x
  3. Step 3: Cross multiply
    2,159.84x = 3,237.32 × 859.80
  4. Step 4: Simplify right side
    2,159.84x = 2,783,447.74
  5. Step 5: Solve for x
    x = 2,783,447.74/2,159.84
  6. Step 6: Final answer
    x = 1,288.73

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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.