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Finding the Fourth Proportional to 1,072.21, 1,479.90 and 698.54

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Solution

The fourth proportional to 1,072.21, 1,479.90 and 698.54 is: 964.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.21 : 1,479.90 = 698.54 : x
  2. Step 2: Convert to fraction form
    1,072.21/1,479.90 = 698.54/x
  3. Step 3: Cross multiply
    1,072.21x = 1,479.90 × 698.54
  4. Step 4: Simplify right side
    1,072.21x = 1,033,769.35
  5. Step 5: Solve for x
    x = 1,033,769.35/1,072.21
  6. Step 6: Final answer
    x = 964.15

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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.