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Finding the Fourth Proportional to 28,003.60, 42,005.40 and 25,865.20

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Solution

The fourth proportional to 28,003.60, 42,005.40 and 25,865.20 is: 38,797.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,003.60 : 42,005.40 = 25,865.20 : x
  2. Step 2: Convert to fraction form
    28,003.60/42,005.40 = 25,865.20/x
  3. Step 3: Cross multiply
    28,003.60x = 42,005.40 × 25,865.20
  4. Step 4: Simplify right side
    28,003.60x = 1,086,478,072.08
  5. Step 5: Solve for x
    x = 1,086,478,072.08/28,003.60
  6. Step 6: Final answer
    x = 38,797.80

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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.