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Finding the Fourth Proportional to 1,319.36, 1,978.37 and 441.55

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Solution

The fourth proportional to 1,319.36, 1,978.37 and 441.55 is: 662.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.36 : 1,978.37 = 441.55 : x
  2. Step 2: Convert to fraction form
    1,319.36/1,978.37 = 441.55/x
  3. Step 3: Cross multiply
    1,319.36x = 1,978.37 × 441.55
  4. Step 4: Simplify right side
    1,319.36x = 873,549.27
  5. Step 5: Solve for x
    x = 873,549.27/1,319.36
  6. Step 6: Final answer
    x = 662.10

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1.5x scale

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.