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Finding the Fourth Proportional to 3,409.55, 5,115.09 and 1,218.50

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Solution

The fourth proportional to 3,409.55, 5,115.09 and 1,218.50 is: 1,828.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,409.55 : 5,115.09 = 1,218.50 : x
  2. Step 2: Convert to fraction form
    3,409.55/5,115.09 = 1,218.50/x
  3. Step 3: Cross multiply
    3,409.55x = 5,115.09 × 1,218.50
  4. Step 4: Simplify right side
    3,409.55x = 6,232,737.17
  5. Step 5: Solve for x
    x = 6,232,737.17/3,409.55
  6. Step 6: Final answer
    x = 1,828.02

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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.