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Finding the Fourth Proportional to 1,319.59, 1,978.40 and 441.58

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Solution

The fourth proportional to 1,319.59, 1,978.40 and 441.58 is: 662.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.59 : 1,978.40 = 441.58 : x
  2. Step 2: Convert to fraction form
    1,319.59/1,978.40 = 441.58/x
  3. Step 3: Cross multiply
    1,319.59x = 1,978.40 × 441.58
  4. Step 4: Simplify right side
    1,319.59x = 873,621.87
  5. Step 5: Solve for x
    x = 873,621.87/1,319.59
  6. Step 6: Final answer
    x = 662.04

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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.