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Finding the Fourth Proportional to 997.70, 1,496.78 and 313.70

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Solution

The fourth proportional to 997.70, 1,496.78 and 313.70 is: 470.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.70 : 1,496.78 = 313.70 : x
  2. Step 2: Convert to fraction form
    997.70/1,496.78 = 313.70/x
  3. Step 3: Cross multiply
    997.70x = 1,496.78 × 313.70
  4. Step 4: Simplify right side
    997.70x = 469,530.83
  5. Step 5: Solve for x
    x = 469,530.83/997.70
  6. Step 6: Final answer
    x = 470.62

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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.