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Finding the Fourth Proportional to 3,405.80, 4,699.85 and 1,913.69

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Solution

The fourth proportional to 3,405.80, 4,699.85 and 1,913.69 is: 2,640.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,405.80 : 4,699.85 = 1,913.69 : x
  2. Step 2: Convert to fraction form
    3,405.80/4,699.85 = 1,913.69/x
  3. Step 3: Cross multiply
    3,405.80x = 4,699.85 × 1,913.69
  4. Step 4: Simplify right side
    3,405.80x = 8,994,055.95
  5. Step 5: Solve for x
    x = 8,994,055.95/3,405.80
  6. Step 6: Final answer
    x = 2,640.81

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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.