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Finding the Fourth Proportional to 25,388.80, 38,079.60 and 7,860.40

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Solution

The fourth proportional to 25,388.80, 38,079.60 and 7,860.40 is: 11,789.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,388.80 : 38,079.60 = 7,860.40 : x
  2. Step 2: Convert to fraction form
    25,388.80/38,079.60 = 7,860.40/x
  3. Step 3: Cross multiply
    25,388.80x = 38,079.60 × 7,860.40
  4. Step 4: Simplify right side
    25,388.80x = 299,320,887.84
  5. Step 5: Solve for x
    x = 299,320,887.84/25,388.80
  6. Step 6: Final answer
    x = 11,789.49

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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.