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Finding the Fourth Proportional to 853.18, 1,278.41 and 621.00

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Solution

The fourth proportional to 853.18, 1,278.41 and 621.00 is: 930.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.18 : 1,278.41 = 621.00 : x
  2. Step 2: Convert to fraction form
    853.18/1,278.41 = 621.00/x
  3. Step 3: Cross multiply
    853.18x = 1,278.41 × 621.00
  4. Step 4: Simplify right side
    853.18x = 793,887.86
  5. Step 5: Solve for x
    x = 793,887.86/853.18
  6. Step 6: Final answer
    x = 930.51

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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.