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Finding the Fourth Proportional to 1,316.70, 1,971.99 and 667.98

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Solution

The fourth proportional to 1,316.70, 1,971.99 and 667.98 is: 1,000.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.70 : 1,971.99 = 667.98 : x
  2. Step 2: Convert to fraction form
    1,316.70/1,971.99 = 667.98/x
  3. Step 3: Cross multiply
    1,316.70x = 1,971.99 × 667.98
  4. Step 4: Simplify right side
    1,316.70x = 1,317,249.88
  5. Step 5: Solve for x
    x = 1,317,249.88/1,316.70
  6. Step 6: Final answer
    x = 1,000.42

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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.