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Finding the Fourth Proportional to 7,975.63, 10,999.20 and 4,991.74

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Solution

The fourth proportional to 7,975.63, 10,999.20 and 4,991.74 is: 6,884.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,975.63 : 10,999.20 = 4,991.74 : x
  2. Step 2: Convert to fraction form
    7,975.63/10,999.20 = 4,991.74/x
  3. Step 3: Cross multiply
    7,975.63x = 10,999.20 × 4,991.74
  4. Step 4: Simplify right side
    7,975.63x = 54,905,137.83
  5. Step 5: Solve for x
    x = 54,905,137.83/7,975.63
  6. Step 6: Final answer
    x = 6,884.11

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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.