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Finding the Fourth Proportional to 981.36, 1,346.40 and 955.80

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Solution

The fourth proportional to 981.36, 1,346.40 and 955.80 is: 1,311.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.36 : 1,346.40 = 955.80 : x
  2. Step 2: Convert to fraction form
    981.36/1,346.40 = 955.80/x
  3. Step 3: Cross multiply
    981.36x = 1,346.40 × 955.80
  4. Step 4: Simplify right side
    981.36x = 1,286,889.12
  5. Step 5: Solve for x
    x = 1,286,889.12/981.36
  6. Step 6: Final answer
    x = 1,311.33

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.