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Finding the Fourth Proportional to 6,615.89, 9,129.20 and 3,783.99

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Solution

The fourth proportional to 6,615.89, 9,129.20 and 3,783.99 is: 5,221.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,615.89 : 9,129.20 = 3,783.99 : x
  2. Step 2: Convert to fraction form
    6,615.89/9,129.20 = 3,783.99/x
  3. Step 3: Cross multiply
    6,615.89x = 9,129.20 × 3,783.99
  4. Step 4: Simplify right side
    6,615.89x = 34,544,782.59
  5. Step 5: Solve for x
    x = 34,544,782.59/6,615.89
  6. Step 6: Final answer
    x = 5,221.49

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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.