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Finding the Fourth Proportional to 1,029.45, 1,542.36 and 857.22

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Solution

The fourth proportional to 1,029.45, 1,542.36 and 857.22 is: 1,284.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.45 : 1,542.36 = 857.22 : x
  2. Step 2: Convert to fraction form
    1,029.45/1,542.36 = 857.22/x
  3. Step 3: Cross multiply
    1,029.45x = 1,542.36 × 857.22
  4. Step 4: Simplify right side
    1,029.45x = 1,322,141.84
  5. Step 5: Solve for x
    x = 1,322,141.84/1,029.45
  6. Step 6: Final answer
    x = 1,284.32

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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.