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Finding the Fourth Proportional to 885.86, 1,326.73 and 855.11

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Solution

The fourth proportional to 885.86, 1,326.73 and 855.11 is: 1,280.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.86 : 1,326.73 = 855.11 : x
  2. Step 2: Convert to fraction form
    885.86/1,326.73 = 855.11/x
  3. Step 3: Cross multiply
    885.86x = 1,326.73 × 855.11
  4. Step 4: Simplify right side
    885.86x = 1,134,500.09
  5. Step 5: Solve for x
    x = 1,134,500.09/885.86
  6. Step 6: Final answer
    x = 1,280.68

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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.