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Finding the Fourth Proportional to 11,772, 17,612.64 and 11,687.76

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Solution

The fourth proportional to 11,772, 17,612.64 and 11,687.76 is: 17,486.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,772 : 17,612.64 = 11,687.76 : x
  2. Step 2: Convert to fraction form
    11,772/17,612.64 = 11,687.76/x
  3. Step 3: Cross multiply
    11,772x = 17,612.64 × 11,687.76
  4. Step 4: Simplify right side
    11,772x = 205,852,309.29
  5. Step 5: Solve for x
    x = 205,852,309.29/11,772
  6. Step 6: Final answer
    x = 17,486.60

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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.