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Finding the Fourth Proportional to 2,807.22, 4,209.21 and 858.90

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Solution

The fourth proportional to 2,807.22, 4,209.21 and 858.90 is: 1,287.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,807.22 : 4,209.21 = 858.90 : x
  2. Step 2: Convert to fraction form
    2,807.22/4,209.21 = 858.90/x
  3. Step 3: Cross multiply
    2,807.22x = 4,209.21 × 858.90
  4. Step 4: Simplify right side
    2,807.22x = 3,615,290.47
  5. Step 5: Solve for x
    x = 3,615,290.47/2,807.22
  6. Step 6: Final answer
    x = 1,287.85

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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.