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Finding the Fourth Proportional to 855.54, 1,180.65 and 556.90

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Solution

The fourth proportional to 855.54, 1,180.65 and 556.90 is: 768.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.54 : 1,180.65 = 556.90 : x
  2. Step 2: Convert to fraction form
    855.54/1,180.65 = 556.90/x
  3. Step 3: Cross multiply
    855.54x = 1,180.65 × 556.90
  4. Step 4: Simplify right side
    855.54x = 657,503.99
  5. Step 5: Solve for x
    x = 657,503.99/855.54
  6. Step 6: Final answer
    x = 768.53

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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.