Home / 2,126.40-3,189.89-645.45

Finding the Fourth Proportional to 2,126.40, 3,189.89 and 645.45

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Solution

The fourth proportional to 2,126.40, 3,189.89 and 645.45 is: 968.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,126.40 : 3,189.89 = 645.45 : x
  2. Step 2: Convert to fraction form
    2,126.40/3,189.89 = 645.45/x
  3. Step 3: Cross multiply
    2,126.40x = 3,189.89 × 645.45
  4. Step 4: Simplify right side
    2,126.40x = 2,058,912.19
  5. Step 5: Solve for x
    x = 2,058,912.19/2,126.40
  6. Step 6: Final answer
    x = 968.26

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1.5x scale

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.