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Finding the Fourth Proportional to 6,991.60, 9,638.50 and 4,998.70

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Solution

The fourth proportional to 6,991.60, 9,638.50 and 4,998.70 is: 6,891.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,991.60 : 9,638.50 = 4,998.70 : x
  2. Step 2: Convert to fraction form
    6,991.60/9,638.50 = 4,998.70/x
  3. Step 3: Cross multiply
    6,991.60x = 9,638.50 × 4,998.70
  4. Step 4: Simplify right side
    6,991.60x = 48,179,969.95
  5. Step 5: Solve for x
    x = 48,179,969.95/6,991.60
  6. Step 6: Final answer
    x = 6,891.12

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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.