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Finding the Fourth Proportional to 857.76, 1,276.32 and 854.88

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Solution

The fourth proportional to 857.76, 1,276.32 and 854.88 is: 1,272.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.76 : 1,276.32 = 854.88 : x
  2. Step 2: Convert to fraction form
    857.76/1,276.32 = 854.88/x
  3. Step 3: Cross multiply
    857.76x = 1,276.32 × 854.88
  4. Step 4: Simplify right side
    857.76x = 1,091,100.44
  5. Step 5: Solve for x
    x = 1,091,100.44/857.76
  6. Step 6: Final answer
    x = 1,272.03

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.