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Finding the Fourth Proportional to 1,121.57, 1,680.97 and 505.12

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Solution

The fourth proportional to 1,121.57, 1,680.97 and 505.12 is: 757.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.57 : 1,680.97 = 505.12 : x
  2. Step 2: Convert to fraction form
    1,121.57/1,680.97 = 505.12/x
  3. Step 3: Cross multiply
    1,121.57x = 1,680.97 × 505.12
  4. Step 4: Simplify right side
    1,121.57x = 849,091.57
  5. Step 5: Solve for x
    x = 849,091.57/1,121.57
  6. Step 6: Final answer
    x = 757.06

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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.