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Finding the Fourth Proportional to 1,318.44, 1,977.40 and 859.48

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Solution

The fourth proportional to 1,318.44, 1,977.40 and 859.48 is: 1,289.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.44 : 1,977.40 = 859.48 : x
  2. Step 2: Convert to fraction form
    1,318.44/1,977.40 = 859.48/x
  3. Step 3: Cross multiply
    1,318.44x = 1,977.40 × 859.48
  4. Step 4: Simplify right side
    1,318.44x = 1,699,535.75
  5. Step 5: Solve for x
    x = 1,699,535.75/1,318.44
  6. Step 6: Final answer
    x = 1,289.05

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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.