Home / 3,561.21-4,914.18-1,989

Finding the Fourth Proportional to 3,561.21, 4,914.18 and 1,989

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Solution

The fourth proportional to 3,561.21, 4,914.18 and 1,989 is: 2,744.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,561.21 : 4,914.18 = 1,989 : x
  2. Step 2: Convert to fraction form
    3,561.21/4,914.18 = 1,989/x
  3. Step 3: Cross multiply
    3,561.21x = 4,914.18 × 1,989
  4. Step 4: Simplify right side
    3,561.21x = 9,774,304.02
  5. Step 5: Solve for x
    x = 9,774,304.02/3,561.21
  6. Step 6: Final answer
    x = 2,744.66

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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.