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Finding the Fourth Proportional to 25,646.40, 38,469.60 and 20,980.80

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Solution

The fourth proportional to 25,646.40, 38,469.60 and 20,980.80 is: 31,471.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,646.40 : 38,469.60 = 20,980.80 : x
  2. Step 2: Convert to fraction form
    25,646.40/38,469.60 = 20,980.80/x
  3. Step 3: Cross multiply
    25,646.40x = 38,469.60 × 20,980.80
  4. Step 4: Simplify right side
    25,646.40x = 807,122,983.68
  5. Step 5: Solve for x
    x = 807,122,983.68/25,646.40
  6. Step 6: Final answer
    x = 31,471.20

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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.