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Finding the Fourth Proportional to 886.78, 1,224.35 and 620.74

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Solution

The fourth proportional to 886.78, 1,224.35 and 620.74 is: 857.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.78 : 1,224.35 = 620.74 : x
  2. Step 2: Convert to fraction form
    886.78/1,224.35 = 620.74/x
  3. Step 3: Cross multiply
    886.78x = 1,224.35 × 620.74
  4. Step 4: Simplify right side
    886.78x = 760,003.02
  5. Step 5: Solve for x
    x = 760,003.02/886.78
  6. Step 6: Final answer
    x = 857.04

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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.