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Finding the Fourth Proportional to 11,991.84, 17,989.68 and 5,417.76

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Solution

The fourth proportional to 11,991.84, 17,989.68 and 5,417.76 is: 8,127.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,991.84 : 17,989.68 = 5,417.76 : x
  2. Step 2: Convert to fraction form
    11,991.84/17,989.68 = 5,417.76/x
  3. Step 3: Cross multiply
    11,991.84x = 17,989.68 × 5,417.76
  4. Step 4: Simplify right side
    11,991.84x = 97,463,768.72
  5. Step 5: Solve for x
    x = 97,463,768.72/11,991.84
  6. Step 6: Final answer
    x = 8,127.51

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Similar ratio
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1.5x scale

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.