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Finding the Fourth Proportional to 2,739.79, 4,108.60 and 890.45

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Solution

The fourth proportional to 2,739.79, 4,108.60 and 890.45 is: 1,335.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,739.79 : 4,108.60 = 890.45 : x
  2. Step 2: Convert to fraction form
    2,739.79/4,108.60 = 890.45/x
  3. Step 3: Cross multiply
    2,739.79x = 4,108.60 × 890.45
  4. Step 4: Simplify right side
    2,739.79x = 3,658,502.87
  5. Step 5: Solve for x
    x = 3,658,502.87/2,739.79
  6. Step 6: Final answer
    x = 1,335.32

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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.