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Finding the Fourth Proportional to 1,121.00, 1,680.80 and 976.11

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Solution

The fourth proportional to 1,121.00, 1,680.80 and 976.11 is: 1,463.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.00 : 1,680.80 = 976.11 : x
  2. Step 2: Convert to fraction form
    1,121.00/1,680.80 = 976.11/x
  3. Step 3: Cross multiply
    1,121.00x = 1,680.80 × 976.11
  4. Step 4: Simplify right side
    1,121.00x = 1,640,649.45
  5. Step 5: Solve for x
    x = 1,640,649.45/1,121.00
  6. Step 6: Final answer
    x = 1,463.56

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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.