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Finding the Fourth Proportional to 855.09, 1,179.61 and 575.40

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Solution

The fourth proportional to 855.09, 1,179.61 and 575.40 is: 793.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.09 : 1,179.61 = 575.40 : x
  2. Step 2: Convert to fraction form
    855.09/1,179.61 = 575.40/x
  3. Step 3: Cross multiply
    855.09x = 1,179.61 × 575.40
  4. Step 4: Simplify right side
    855.09x = 678,746.35
  5. Step 5: Solve for x
    x = 678,746.35/855.09
  6. Step 6: Final answer
    x = 793.77

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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.