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Finding the Fourth Proportional to 2,804.80, 4,207.80 and 857.20

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Solution

The fourth proportional to 2,804.80, 4,207.80 and 857.20 is: 1,285.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,804.80 : 4,207.80 = 857.20 : x
  2. Step 2: Convert to fraction form
    2,804.80/4,207.80 = 857.20/x
  3. Step 3: Cross multiply
    2,804.80x = 4,207.80 × 857.20
  4. Step 4: Simplify right side
    2,804.80x = 3,606,926.16
  5. Step 5: Solve for x
    x = 3,606,926.16/2,804.80
  6. Step 6: Final answer
    x = 1,285.98

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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.