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Finding the Fourth Proportional to 981.75, 1,353.60 and 649.44

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Solution

The fourth proportional to 981.75, 1,353.60 and 649.44 is: 895.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.75 : 1,353.60 = 649.44 : x
  2. Step 2: Convert to fraction form
    981.75/1,353.60 = 649.44/x
  3. Step 3: Cross multiply
    981.75x = 1,353.60 × 649.44
  4. Step 4: Simplify right side
    981.75x = 879,081.98
  5. Step 5: Solve for x
    x = 879,081.98/981.75
  6. Step 6: Final answer
    x = 895.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.