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Finding the Fourth Proportional to 698.12, 1,047.18 and 235.90

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Solution

The fourth proportional to 698.12, 1,047.18 and 235.90 is: 353.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.12 : 1,047.18 = 235.90 : x
  2. Step 2: Convert to fraction form
    698.12/1,047.18 = 235.90/x
  3. Step 3: Cross multiply
    698.12x = 1,047.18 × 235.90
  4. Step 4: Simplify right side
    698.12x = 247,029.76
  5. Step 5: Solve for x
    x = 247,029.76/698.12
  6. Step 6: Final answer
    x = 353.85

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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.