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Finding the Fourth Proportional to 859.51, 1,185.74 and 579.66

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Solution

The fourth proportional to 859.51, 1,185.74 and 579.66 is: 799.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.51 : 1,185.74 = 579.66 : x
  2. Step 2: Convert to fraction form
    859.51/1,185.74 = 579.66/x
  3. Step 3: Cross multiply
    859.51x = 1,185.74 × 579.66
  4. Step 4: Simplify right side
    859.51x = 687,326.05
  5. Step 5: Solve for x
    x = 687,326.05/859.51
  6. Step 6: Final answer
    x = 799.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.