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Finding the Fourth Proportional to 2,239.70, 3,359.37 and 778.64

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Solution

The fourth proportional to 2,239.70, 3,359.37 and 778.64 is: 1,167.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,239.70 : 3,359.37 = 778.64 : x
  2. Step 2: Convert to fraction form
    2,239.70/3,359.37 = 778.64/x
  3. Step 3: Cross multiply
    2,239.70x = 3,359.37 × 778.64
  4. Step 4: Simplify right side
    2,239.70x = 2,615,739.86
  5. Step 5: Solve for x
    x = 2,615,739.86/2,239.70
  6. Step 6: Final answer
    x = 1,167.90

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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.