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Finding the Fourth Proportional to 3,615.62, 4,990.95 and 3,109.50

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Solution

The fourth proportional to 3,615.62, 4,990.95 and 3,109.50 is: 4,292.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,615.62 : 4,990.95 = 3,109.50 : x
  2. Step 2: Convert to fraction form
    3,615.62/4,990.95 = 3,109.50/x
  3. Step 3: Cross multiply
    3,615.62x = 4,990.95 × 3,109.50
  4. Step 4: Simplify right side
    3,615.62x = 15,519,359.03
  5. Step 5: Solve for x
    x = 15,519,359.03/3,615.62
  6. Step 6: Final answer
    x = 4,292.31

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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.