Home / 2,905.80-4,009.70-1,786.80

Finding the Fourth Proportional to 2,905.80, 4,009.70 and 1,786.80

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Solution

The fourth proportional to 2,905.80, 4,009.70 and 1,786.80 is: 2,465.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,905.80 : 4,009.70 = 1,786.80 : x
  2. Step 2: Convert to fraction form
    2,905.80/4,009.70 = 1,786.80/x
  3. Step 3: Cross multiply
    2,905.80x = 4,009.70 × 1,786.80
  4. Step 4: Simplify right side
    2,905.80x = 7,164,531.96
  5. Step 5: Solve for x
    x = 7,164,531.96/2,905.80
  6. Step 6: Final answer
    x = 2,465.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.