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Finding the Fourth Proportional to 10,991.79, 15,168.57 and 5,955.90

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Solution

The fourth proportional to 10,991.79, 15,168.57 and 5,955.90 is: 8,219.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,991.79 : 15,168.57 = 5,955.90 : x
  2. Step 2: Convert to fraction form
    10,991.79/15,168.57 = 5,955.90/x
  3. Step 3: Cross multiply
    10,991.79x = 15,168.57 × 5,955.90
  4. Step 4: Simplify right side
    10,991.79x = 90,342,486.06
  5. Step 5: Solve for x
    x = 90,342,486.06/10,991.79
  6. Step 6: Final answer
    x = 8,219.09

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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.