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Finding the Fourth Proportional to 698.32, 1,047.90 and 308.32

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Solution

The fourth proportional to 698.32, 1,047.90 and 308.32 is: 462.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.32 : 1,047.90 = 308.32 : x
  2. Step 2: Convert to fraction form
    698.32/1,047.90 = 308.32/x
  3. Step 3: Cross multiply
    698.32x = 1,047.90 × 308.32
  4. Step 4: Simplify right side
    698.32x = 323,092.96
  5. Step 5: Solve for x
    x = 323,092.96/698.32
  6. Step 6: Final answer
    x = 462.67

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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.