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Finding the Fourth Proportional to 3,159.72, 4,739.58 and 851.28

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Solution

The fourth proportional to 3,159.72, 4,739.58 and 851.28 is: 1,276.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,159.72 : 4,739.58 = 851.28 : x
  2. Step 2: Convert to fraction form
    3,159.72/4,739.58 = 851.28/x
  3. Step 3: Cross multiply
    3,159.72x = 4,739.58 × 851.28
  4. Step 4: Simplify right side
    3,159.72x = 4,034,709.66
  5. Step 5: Solve for x
    x = 4,034,709.66/3,159.72
  6. Step 6: Final answer
    x = 1,276.92

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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.