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Finding the Fourth Proportional to 3,455.81, 4,769.12 and 2,111.64

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Solution

The fourth proportional to 3,455.81, 4,769.12 and 2,111.64 is: 2,914.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,455.81 : 4,769.12 = 2,111.64 : x
  2. Step 2: Convert to fraction form
    3,455.81/4,769.12 = 2,111.64/x
  3. Step 3: Cross multiply
    3,455.81x = 4,769.12 × 2,111.64
  4. Step 4: Simplify right side
    3,455.81x = 10,070,659.28
  5. Step 5: Solve for x
    x = 10,070,659.28/3,455.81
  6. Step 6: Final answer
    x = 2,914.13

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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.