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Finding the Fourth Proportional to 3,620.70, 4,990.21 and 2,987.48

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Solution

The fourth proportional to 3,620.70, 4,990.21 and 2,987.48 is: 4,117.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,620.70 : 4,990.21 = 2,987.48 : x
  2. Step 2: Convert to fraction form
    3,620.70/4,990.21 = 2,987.48/x
  3. Step 3: Cross multiply
    3,620.70x = 4,990.21 × 2,987.48
  4. Step 4: Simplify right side
    3,620.70x = 14,908,157.58
  5. Step 5: Solve for x
    x = 14,908,157.58/3,620.70
  6. Step 6: Final answer
    x = 4,117.48

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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.