Home / 1,421.85-2,132.58-381.90

Finding the Fourth Proportional to 1,421.85, 2,132.58 and 381.90

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Solution

The fourth proportional to 1,421.85, 2,132.58 and 381.90 is: 572.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.85 : 2,132.58 = 381.90 : x
  2. Step 2: Convert to fraction form
    1,421.85/2,132.58 = 381.90/x
  3. Step 3: Cross multiply
    1,421.85x = 2,132.58 × 381.90
  4. Step 4: Simplify right side
    1,421.85x = 814,432.30
  5. Step 5: Solve for x
    x = 814,432.30/1,421.85
  6. Step 6: Final answer
    x = 572.80

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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.