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Finding the Fourth Proportional to 1,319.58, 1,978.59 and 441.87

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Solution

The fourth proportional to 1,319.58, 1,978.59 and 441.87 is: 662.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.58 : 1,978.59 = 441.87 : x
  2. Step 2: Convert to fraction form
    1,319.58/1,978.59 = 441.87/x
  3. Step 3: Cross multiply
    1,319.58x = 1,978.59 × 441.87
  4. Step 4: Simplify right side
    1,319.58x = 874,277.91
  5. Step 5: Solve for x
    x = 874,277.91/1,319.58
  6. Step 6: Final answer
    x = 662.54

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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.