Home / 1,421.80-2,129.73-1,190.02

Finding the Fourth Proportional to 1,421.80, 2,129.73 and 1,190.02

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Solution

The fourth proportional to 1,421.80, 2,129.73 and 1,190.02 is: 1,782.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.80 : 2,129.73 = 1,190.02 : x
  2. Step 2: Convert to fraction form
    1,421.80/2,129.73 = 1,190.02/x
  3. Step 3: Cross multiply
    1,421.80x = 2,129.73 × 1,190.02
  4. Step 4: Simplify right side
    1,421.80x = 2,534,421.29
  5. Step 5: Solve for x
    x = 2,534,421.29/1,421.80
  6. Step 6: Final answer
    x = 1,782.54

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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.