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Finding the Fourth Proportional to 1,326.28, 1,989.42 and 389.32

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Solution

The fourth proportional to 1,326.28, 1,989.42 and 389.32 is: 583.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.28 : 1,989.42 = 389.32 : x
  2. Step 2: Convert to fraction form
    1,326.28/1,989.42 = 389.32/x
  3. Step 3: Cross multiply
    1,326.28x = 1,989.42 × 389.32
  4. Step 4: Simplify right side
    1,326.28x = 774,520.99
  5. Step 5: Solve for x
    x = 774,520.99/1,326.28
  6. Step 6: Final answer
    x = 583.98

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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.