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Finding the Fourth Proportional to 4,458.60, 6,687.90 and 1,990.80

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Solution

The fourth proportional to 4,458.60, 6,687.90 and 1,990.80 is: 2,986.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,458.60 : 6,687.90 = 1,990.80 : x
  2. Step 2: Convert to fraction form
    4,458.60/6,687.90 = 1,990.80/x
  3. Step 3: Cross multiply
    4,458.60x = 6,687.90 × 1,990.80
  4. Step 4: Simplify right side
    4,458.60x = 13,314,271.32
  5. Step 5: Solve for x
    x = 13,314,271.32/4,458.60
  6. Step 6: Final answer
    x = 2,986.20

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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.