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Finding the Fourth Proportional to 1,121.32, 1,680.36 and 544.60

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Solution

The fourth proportional to 1,121.32, 1,680.36 and 544.60 is: 816.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.32 : 1,680.36 = 544.60 : x
  2. Step 2: Convert to fraction form
    1,121.32/1,680.36 = 544.60/x
  3. Step 3: Cross multiply
    1,121.32x = 1,680.36 × 544.60
  4. Step 4: Simplify right side
    1,121.32x = 915,124.06
  5. Step 5: Solve for x
    x = 915,124.06/1,121.32
  6. Step 6: Final answer
    x = 816.11

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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.