Home / 1,287.80-1,926.90-1,172.60

Finding the Fourth Proportional to 1,287.80, 1,926.90 and 1,172.60

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Solution

The fourth proportional to 1,287.80, 1,926.90 and 1,172.60 is: 1,754.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.80 : 1,926.90 = 1,172.60 : x
  2. Step 2: Convert to fraction form
    1,287.80/1,926.90 = 1,172.60/x
  3. Step 3: Cross multiply
    1,287.80x = 1,926.90 × 1,172.60
  4. Step 4: Simplify right side
    1,287.80x = 2,259,482.94
  5. Step 5: Solve for x
    x = 2,259,482.94/1,287.80
  6. Step 6: Final answer
    x = 1,754.53

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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.