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Finding the Fourth Proportional to 1,038.09, 1,556.83 and 855.03

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Solution

The fourth proportional to 1,038.09, 1,556.83 and 855.03 is: 1,282.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.09 : 1,556.83 = 855.03 : x
  2. Step 2: Convert to fraction form
    1,038.09/1,556.83 = 855.03/x
  3. Step 3: Cross multiply
    1,038.09x = 1,556.83 × 855.03
  4. Step 4: Simplify right side
    1,038.09x = 1,331,134.22
  5. Step 5: Solve for x
    x = 1,331,134.22/1,038.09
  6. Step 6: Final answer
    x = 1,282.29

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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.