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Finding the Fourth Proportional to 12,615.04, 18,932.64 and 7,425.28

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Solution

The fourth proportional to 12,615.04, 18,932.64 and 7,425.28 is: 11,143.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,615.04 : 18,932.64 = 7,425.28 : x
  2. Step 2: Convert to fraction form
    12,615.04/18,932.64 = 7,425.28/x
  3. Step 3: Cross multiply
    12,615.04x = 18,932.64 × 7,425.28
  4. Step 4: Simplify right side
    12,615.04x = 140,580,153.14
  5. Step 5: Solve for x
    x = 140,580,153.14/12,615.04
  6. Step 6: Final answer
    x = 11,143.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.