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Finding the Fourth Proportional to 855.18, 1,180.71 and 621.90

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Solution

The fourth proportional to 855.18, 1,180.71 and 621.90 is: 858.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.18 : 1,180.71 = 621.90 : x
  2. Step 2: Convert to fraction form
    855.18/1,180.71 = 621.90/x
  3. Step 3: Cross multiply
    855.18x = 1,180.71 × 621.90
  4. Step 4: Simplify right side
    855.18x = 734,283.55
  5. Step 5: Solve for x
    x = 734,283.55/855.18
  6. Step 6: Final answer
    x = 858.63

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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.