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Finding the Fourth Proportional to 1,311.54, 1,811.54 and 981.44

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Solution

The fourth proportional to 1,311.54, 1,811.54 and 981.44 is: 1,355.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.54 : 1,811.54 = 981.44 : x
  2. Step 2: Convert to fraction form
    1,311.54/1,811.54 = 981.44/x
  3. Step 3: Cross multiply
    1,311.54x = 1,811.54 × 981.44
  4. Step 4: Simplify right side
    1,311.54x = 1,777,917.82
  5. Step 5: Solve for x
    x = 1,777,917.82/1,311.54
  6. Step 6: Final answer
    x = 1,355.60

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1.5x scale

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.