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Finding the Fourth Proportional to 1,319.01, 1,978.34 and 394.32

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Solution

The fourth proportional to 1,319.01, 1,978.34 and 394.32 is: 591.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.01 : 1,978.34 = 394.32 : x
  2. Step 2: Convert to fraction form
    1,319.01/1,978.34 = 394.32/x
  3. Step 3: Cross multiply
    1,319.01x = 1,978.34 × 394.32
  4. Step 4: Simplify right side
    1,319.01x = 780,099.03
  5. Step 5: Solve for x
    x = 780,099.03/1,319.01
  6. Step 6: Final answer
    x = 591.43

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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.