Home / 2,166.21-2,989.62-1,420.77

Finding the Fourth Proportional to 2,166.21, 2,989.62 and 1,420.77

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Solution

The fourth proportional to 2,166.21, 2,989.62 and 1,420.77 is: 1,960.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,166.21 : 2,989.62 = 1,420.77 : x
  2. Step 2: Convert to fraction form
    2,166.21/2,989.62 = 1,420.77/x
  3. Step 3: Cross multiply
    2,166.21x = 2,989.62 × 1,420.77
  4. Step 4: Simplify right side
    2,166.21x = 4,247,562.41
  5. Step 5: Solve for x
    x = 4,247,562.41/2,166.21
  6. Step 6: Final answer
    x = 1,960.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.