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Finding the Fourth Proportional to 1,121.40, 1,680.72 and 573.27

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Solution

The fourth proportional to 1,121.40, 1,680.72 and 573.27 is: 859.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.40 : 1,680.72 = 573.27 : x
  2. Step 2: Convert to fraction form
    1,121.40/1,680.72 = 573.27/x
  3. Step 3: Cross multiply
    1,121.40x = 1,680.72 × 573.27
  4. Step 4: Simplify right side
    1,121.40x = 963,506.35
  5. Step 5: Solve for x
    x = 963,506.35/1,121.40
  6. Step 6: Final answer
    x = 859.20

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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.