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Finding the Fourth Proportional to 1,808.80, 2,716.40 and 1,322.40

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Solution

The fourth proportional to 1,808.80, 2,716.40 and 1,322.40 is: 1,985.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,808.80 : 2,716.40 = 1,322.40 : x
  2. Step 2: Convert to fraction form
    1,808.80/2,716.40 = 1,322.40/x
  3. Step 3: Cross multiply
    1,808.80x = 2,716.40 × 1,322.40
  4. Step 4: Simplify right side
    1,808.80x = 3,592,167.36
  5. Step 5: Solve for x
    x = 3,592,167.36/1,808.80
  6. Step 6: Final answer
    x = 1,985.94

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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.