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Finding the Fourth Proportional to 11,718.66, 17,580.02 and 5,145.51

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Solution

The fourth proportional to 11,718.66, 17,580.02 and 5,145.51 is: 7,719.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,718.66 : 17,580.02 = 5,145.51 : x
  2. Step 2: Convert to fraction form
    11,718.66/17,580.02 = 5,145.51/x
  3. Step 3: Cross multiply
    11,718.66x = 17,580.02 × 5,145.51
  4. Step 4: Simplify right side
    11,718.66x = 90,458,142.98
  5. Step 5: Solve for x
    x = 90,458,142.98/11,718.66
  6. Step 6: Final answer
    x = 7,719.15

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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.