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Finding the Fourth Proportional to 698.29, 1,047.41 and 389.37

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Solution

The fourth proportional to 698.29, 1,047.41 and 389.37 is: 584.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.29 : 1,047.41 = 389.37 : x
  2. Step 2: Convert to fraction form
    698.29/1,047.41 = 389.37/x
  3. Step 3: Cross multiply
    698.29x = 1,047.41 × 389.37
  4. Step 4: Simplify right side
    698.29x = 407,835.66
  5. Step 5: Solve for x
    x = 407,835.66/698.29
  6. Step 6: Final answer
    x = 584.05

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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.