Home / 39,078.40-53,928.10-21,173.88

Finding the Fourth Proportional to 39,078.40, 53,928.10 and 21,173.88

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Solution

The fourth proportional to 39,078.40, 53,928.10 and 21,173.88 is: 29,219.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,078.40 : 53,928.10 = 21,173.88 : x
  2. Step 2: Convert to fraction form
    39,078.40/53,928.10 = 21,173.88/x
  3. Step 3: Cross multiply
    39,078.40x = 53,928.10 × 21,173.88
  4. Step 4: Simplify right side
    39,078.40x = 1,141,867,118.03
  5. Step 5: Solve for x
    x = 1,141,867,118.03/39,078.40
  6. Step 6: Final answer
    x = 29,219.90

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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.