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Finding the Fourth Proportional to 4,990.60, 7,485.90 and 2,686.60

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Solution

The fourth proportional to 4,990.60, 7,485.90 and 2,686.60 is: 4,029.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,990.60 : 7,485.90 = 2,686.60 : x
  2. Step 2: Convert to fraction form
    4,990.60/7,485.90 = 2,686.60/x
  3. Step 3: Cross multiply
    4,990.60x = 7,485.90 × 2,686.60
  4. Step 4: Simplify right side
    4,990.60x = 20,111,618.94
  5. Step 5: Solve for x
    x = 20,111,618.94/4,990.60
  6. Step 6: Final answer
    x = 4,029.90

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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.