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Finding the Fourth Proportional to 38,656.80, 57,985.20 and 20,186.40

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Solution

The fourth proportional to 38,656.80, 57,985.20 and 20,186.40 is: 30,279.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,656.80 : 57,985.20 = 20,186.40 : x
  2. Step 2: Convert to fraction form
    38,656.80/57,985.20 = 20,186.40/x
  3. Step 3: Cross multiply
    38,656.80x = 57,985.20 × 20,186.40
  4. Step 4: Simplify right side
    38,656.80x = 1,170,512,441.28
  5. Step 5: Solve for x
    x = 1,170,512,441.28/38,656.80
  6. Step 6: Final answer
    x = 30,279.60

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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.