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Finding the Fourth Proportional to 981.21, 1,469.79 and 786.54

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Solution

The fourth proportional to 981.21, 1,469.79 and 786.54 is: 1,178.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.21 : 1,469.79 = 786.54 : x
  2. Step 2: Convert to fraction form
    981.21/1,469.79 = 786.54/x
  3. Step 3: Cross multiply
    981.21x = 1,469.79 × 786.54
  4. Step 4: Simplify right side
    981.21x = 1,156,048.63
  5. Step 5: Solve for x
    x = 1,156,048.63/981.21
  6. Step 6: Final answer
    x = 1,178.19

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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.