Home / 1,421.01-2,132.73-690.80

Finding the Fourth Proportional to 1,421.01, 2,132.73 and 690.80

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Solution

The fourth proportional to 1,421.01, 2,132.73 and 690.80 is: 1,036.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.01 : 2,132.73 = 690.80 : x
  2. Step 2: Convert to fraction form
    1,421.01/2,132.73 = 690.80/x
  3. Step 3: Cross multiply
    1,421.01x = 2,132.73 × 690.80
  4. Step 4: Simplify right side
    1,421.01x = 1,473,279.22
  5. Step 5: Solve for x
    x = 1,473,279.22/1,421.01
  6. Step 6: Final answer
    x = 1,036.78

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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.