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Finding the Fourth Proportional to 698.19, 1,047.17 and 259.65

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Solution

The fourth proportional to 698.19, 1,047.17 and 259.65 is: 389.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.19 : 1,047.17 = 259.65 : x
  2. Step 2: Convert to fraction form
    698.19/1,047.17 = 259.65/x
  3. Step 3: Cross multiply
    698.19x = 1,047.17 × 259.65
  4. Step 4: Simplify right side
    698.19x = 271,896.39
  5. Step 5: Solve for x
    x = 271,896.39/698.19
  6. Step 6: Final answer
    x = 389.43

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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.