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Finding the Fourth Proportional to 6,628.80, 9,145.80 and 4,112.88

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Solution

The fourth proportional to 6,628.80, 9,145.80 and 4,112.88 is: 5,674.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,628.80 : 9,145.80 = 4,112.88 : x
  2. Step 2: Convert to fraction form
    6,628.80/9,145.80 = 4,112.88/x
  3. Step 3: Cross multiply
    6,628.80x = 9,145.80 × 4,112.88
  4. Step 4: Simplify right side
    6,628.80x = 37,615,577.90
  5. Step 5: Solve for x
    x = 37,615,577.90/6,628.80
  6. Step 6: Final answer
    x = 5,674.57

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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.