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Finding the Fourth Proportional to 1,063.05, 1,467.40 and 621.09

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Solution

The fourth proportional to 1,063.05, 1,467.40 and 621.09 is: 857.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,063.05 : 1,467.40 = 621.09 : x
  2. Step 2: Convert to fraction form
    1,063.05/1,467.40 = 621.09/x
  3. Step 3: Cross multiply
    1,063.05x = 1,467.40 × 621.09
  4. Step 4: Simplify right side
    1,063.05x = 911,388.24
  5. Step 5: Solve for x
    x = 911,388.24/1,063.05
  6. Step 6: Final answer
    x = 857.34

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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.