Home / 1,420.46-2,130.88-380.49

Finding the Fourth Proportional to 1,420.46, 2,130.88 and 380.49

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Solution

The fourth proportional to 1,420.46, 2,130.88 and 380.49 is: 570.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.46 : 2,130.88 = 380.49 : x
  2. Step 2: Convert to fraction form
    1,420.46/2,130.88 = 380.49/x
  3. Step 3: Cross multiply
    1,420.46x = 2,130.88 × 380.49
  4. Step 4: Simplify right side
    1,420.46x = 810,778.53
  5. Step 5: Solve for x
    x = 810,778.53/1,420.46
  6. Step 6: Final answer
    x = 570.79

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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.