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Finding the Fourth Proportional to 12,991.58, 17,916.56 and 8,513.68

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Solution

The fourth proportional to 12,991.58, 17,916.56 and 8,513.68 is: 11,741.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.58 : 17,916.56 = 8,513.68 : x
  2. Step 2: Convert to fraction form
    12,991.58/17,916.56 = 8,513.68/x
  3. Step 3: Cross multiply
    12,991.58x = 17,916.56 × 8,513.68
  4. Step 4: Simplify right side
    12,991.58x = 152,535,858.54
  5. Step 5: Solve for x
    x = 152,535,858.54/12,991.58
  6. Step 6: Final answer
    x = 11,741.13

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1.5x scale

Why These Related Problems?

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