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Finding the Fourth Proportional to 969.98, 1,455.21 and 311.85

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Solution

The fourth proportional to 969.98, 1,455.21 and 311.85 is: 467.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.98 : 1,455.21 = 311.85 : x
  2. Step 2: Convert to fraction form
    969.98/1,455.21 = 311.85/x
  3. Step 3: Cross multiply
    969.98x = 1,455.21 × 311.85
  4. Step 4: Simplify right side
    969.98x = 453,807.24
  5. Step 5: Solve for x
    x = 453,807.24/969.98
  6. Step 6: Final answer
    x = 467.85

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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.