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Finding the Fourth Proportional to 993.78, 1,487.57 and 889.44

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Solution

The fourth proportional to 993.78, 1,487.57 and 889.44 is: 1,331.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.78 : 1,487.57 = 889.44 : x
  2. Step 2: Convert to fraction form
    993.78/1,487.57 = 889.44/x
  3. Step 3: Cross multiply
    993.78x = 1,487.57 × 889.44
  4. Step 4: Simplify right side
    993.78x = 1,323,099.81
  5. Step 5: Solve for x
    x = 1,323,099.81/993.78
  6. Step 6: Final answer
    x = 1,331.38

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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.