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Finding the Fourth Proportional to 1,317.76, 1,974.96 and 993.76

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Solution

The fourth proportional to 1,317.76, 1,974.96 and 993.76 is: 1,489.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.76 : 1,974.96 = 993.76 : x
  2. Step 2: Convert to fraction form
    1,317.76/1,974.96 = 993.76/x
  3. Step 3: Cross multiply
    1,317.76x = 1,974.96 × 993.76
  4. Step 4: Simplify right side
    1,317.76x = 1,962,636.25
  5. Step 5: Solve for x
    x = 1,962,636.25/1,317.76
  6. Step 6: Final answer
    x = 1,489.37

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1.5x scale

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.