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Finding the Fourth Proportional to 6,615.68, 9,129.74 and 3,631.79

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Solution

The fourth proportional to 6,615.68, 9,129.74 and 3,631.79 is: 5,011.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,615.68 : 9,129.74 = 3,631.79 : x
  2. Step 2: Convert to fraction form
    6,615.68/9,129.74 = 3,631.79/x
  3. Step 3: Cross multiply
    6,615.68x = 9,129.74 × 3,631.79
  4. Step 4: Simplify right side
    6,615.68x = 33,157,298.43
  5. Step 5: Solve for x
    x = 33,157,298.43/6,615.68
  6. Step 6: Final answer
    x = 5,011.93

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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.