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Finding the Fourth Proportional to 5,638.86, 7,780.90 and 3,120.60

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Solution

The fourth proportional to 5,638.86, 7,780.90 and 3,120.60 is: 4,306.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,638.86 : 7,780.90 = 3,120.60 : x
  2. Step 2: Convert to fraction form
    5,638.86/7,780.90 = 3,120.60/x
  3. Step 3: Cross multiply
    5,638.86x = 7,780.90 × 3,120.60
  4. Step 4: Simplify right side
    5,638.86x = 24,281,076.54
  5. Step 5: Solve for x
    x = 24,281,076.54/5,638.86
  6. Step 6: Final answer
    x = 4,306.03

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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.