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Finding the Fourth Proportional to 2,666.68, 3,980.84 and 2,118.10

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Solution

The fourth proportional to 2,666.68, 3,980.84 and 2,118.10 is: 3,161.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.68 : 3,980.84 = 2,118.10 : x
  2. Step 2: Convert to fraction form
    2,666.68/3,980.84 = 2,118.10/x
  3. Step 3: Cross multiply
    2,666.68x = 3,980.84 × 2,118.10
  4. Step 4: Simplify right side
    2,666.68x = 8,431,817.20
  5. Step 5: Solve for x
    x = 8,431,817.20/2,666.68
  6. Step 6: Final answer
    x = 3,161.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.