Home / 1,421.06-2,131.61-690.48

Finding the Fourth Proportional to 1,421.06, 2,131.61 and 690.48

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Solution

The fourth proportional to 1,421.06, 2,131.61 and 690.48 is: 1,035.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.06 : 2,131.61 = 690.48 : x
  2. Step 2: Convert to fraction form
    1,421.06/2,131.61 = 690.48/x
  3. Step 3: Cross multiply
    1,421.06x = 2,131.61 × 690.48
  4. Step 4: Simplify right side
    1,421.06x = 1,471,830.62
  5. Step 5: Solve for x
    x = 1,471,830.62/1,421.06
  6. Step 6: Final answer
    x = 1,035.73

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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.