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Finding the Fourth Proportional to 9,121.64, 12,505.78 and 8,955.56

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Solution

The fourth proportional to 9,121.64, 12,505.78 and 8,955.56 is: 12,278.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,121.64 : 12,505.78 = 8,955.56 : x
  2. Step 2: Convert to fraction form
    9,121.64/12,505.78 = 8,955.56/x
  3. Step 3: Cross multiply
    9,121.64x = 12,505.78 × 8,955.56
  4. Step 4: Simplify right side
    9,121.64x = 111,996,263.14
  5. Step 5: Solve for x
    x = 111,996,263.14/9,121.64
  6. Step 6: Final answer
    x = 12,278.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.