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Finding the Fourth Proportional to 3,409.74, 4,705.55 and 1,917.80

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Solution

The fourth proportional to 3,409.74, 4,705.55 and 1,917.80 is: 2,646.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,409.74 : 4,705.55 = 1,917.80 : x
  2. Step 2: Convert to fraction form
    3,409.74/4,705.55 = 1,917.80/x
  3. Step 3: Cross multiply
    3,409.74x = 4,705.55 × 1,917.80
  4. Step 4: Simplify right side
    3,409.74x = 9,024,270.67
  5. Step 5: Solve for x
    x = 9,024,270.67/3,409.74
  6. Step 6: Final answer
    x = 2,646.62

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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.