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Finding the Fourth Proportional to 881.36, 1,320.80 and 855.08

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Solution

The fourth proportional to 881.36, 1,320.80 and 855.08 is: 1,281.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.36 : 1,320.80 = 855.08 : x
  2. Step 2: Convert to fraction form
    881.36/1,320.80 = 855.08/x
  3. Step 3: Cross multiply
    881.36x = 1,320.80 × 855.08
  4. Step 4: Simplify right side
    881.36x = 1,129,389.66
  5. Step 5: Solve for x
    x = 1,129,389.66/881.36
  6. Step 6: Final answer
    x = 1,281.42

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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.