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Finding the Fourth Proportional to 12,606.88, 17,390.64 and 7,890.16

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Solution

The fourth proportional to 12,606.88, 17,390.64 and 7,890.16 is: 10,884.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,606.88 : 17,390.64 = 7,890.16 : x
  2. Step 2: Convert to fraction form
    12,606.88/17,390.64 = 7,890.16/x
  3. Step 3: Cross multiply
    12,606.88x = 17,390.64 × 7,890.16
  4. Step 4: Simplify right side
    12,606.88x = 137,214,932.10
  5. Step 5: Solve for x
    x = 137,214,932.10/12,606.88
  6. Step 6: Final answer
    x = 10,884.13

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.