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Finding the Fourth Proportional to 1,320.03, 1,821.69 and 854.28

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Solution

The fourth proportional to 1,320.03, 1,821.69 and 854.28 is: 1,178.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.03 : 1,821.69 = 854.28 : x
  2. Step 2: Convert to fraction form
    1,320.03/1,821.69 = 854.28/x
  3. Step 3: Cross multiply
    1,320.03x = 1,821.69 × 854.28
  4. Step 4: Simplify right side
    1,320.03x = 1,556,233.33
  5. Step 5: Solve for x
    x = 1,556,233.33/1,320.03
  6. Step 6: Final answer
    x = 1,178.94

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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.