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Finding the Fourth Proportional to 855.61, 1,179.61 and 655.85

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Solution

The fourth proportional to 855.61, 1,179.61 and 655.85 is: 904.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.61 : 1,179.61 = 655.85 : x
  2. Step 2: Convert to fraction form
    855.61/1,179.61 = 655.85/x
  3. Step 3: Cross multiply
    855.61x = 1,179.61 × 655.85
  4. Step 4: Simplify right side
    855.61x = 773,645.58
  5. Step 5: Solve for x
    x = 773,645.58/855.61
  6. Step 6: Final answer
    x = 904.20

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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.