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Finding the Fourth Proportional to 1,419.54, 1,958.42 and 859.64

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Solution

The fourth proportional to 1,419.54, 1,958.42 and 859.64 is: 1,185.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.54 : 1,958.42 = 859.64 : x
  2. Step 2: Convert to fraction form
    1,419.54/1,958.42 = 859.64/x
  3. Step 3: Cross multiply
    1,419.54x = 1,958.42 × 859.64
  4. Step 4: Simplify right side
    1,419.54x = 1,683,522.08
  5. Step 5: Solve for x
    x = 1,683,522.08/1,419.54
  6. Step 6: Final answer
    x = 1,185.96

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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.