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Finding the Fourth Proportional to 2,805.06, 4,207.60 and 857.16

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Solution

The fourth proportional to 2,805.06, 4,207.60 and 857.16 is: 1,285.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,805.06 : 4,207.60 = 857.16 : x
  2. Step 2: Convert to fraction form
    2,805.06/4,207.60 = 857.16/x
  3. Step 3: Cross multiply
    2,805.06x = 4,207.60 × 857.16
  4. Step 4: Simplify right side
    2,805.06x = 3,606,586.42
  5. Step 5: Solve for x
    x = 3,606,586.42/2,805.06
  6. Step 6: Final answer
    x = 1,285.74

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1.5x scale

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.