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Finding the Fourth Proportional to 6,615.68, 9,129.84 and 3,821.12

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Solution

The fourth proportional to 6,615.68, 9,129.84 and 3,821.12 is: 5,273.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,615.68 : 9,129.84 = 3,821.12 : x
  2. Step 2: Convert to fraction form
    6,615.68/9,129.84 = 3,821.12/x
  3. Step 3: Cross multiply
    6,615.68x = 9,129.84 × 3,821.12
  4. Step 4: Simplify right side
    6,615.68x = 34,886,214.22
  5. Step 5: Solve for x
    x = 34,886,214.22/6,615.68
  6. Step 6: Final answer
    x = 5,273.26

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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.