Home / 1,311.50-1,812.20-976.74

Finding the Fourth Proportional to 1,311.50, 1,812.20 and 976.74

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Solution

The fourth proportional to 1,311.50, 1,812.20 and 976.74 is: 1,349.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.50 : 1,812.20 = 976.74 : x
  2. Step 2: Convert to fraction form
    1,311.50/1,812.20 = 976.74/x
  3. Step 3: Cross multiply
    1,311.50x = 1,812.20 × 976.74
  4. Step 4: Simplify right side
    1,311.50x = 1,770,048.23
  5. Step 5: Solve for x
    x = 1,770,048.23/1,311.50
  6. Step 6: Final answer
    x = 1,349.64

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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.