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Finding the Fourth Proportional to 12,991.68, 17,918.72 and 9,012.80

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Solution

The fourth proportional to 12,991.68, 17,918.72 and 9,012.80 is: 12,430.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.68 : 17,918.72 = 9,012.80 : x
  2. Step 2: Convert to fraction form
    12,991.68/17,918.72 = 9,012.80/x
  3. Step 3: Cross multiply
    12,991.68x = 17,918.72 × 9,012.80
  4. Step 4: Simplify right side
    12,991.68x = 161,497,839.62
  5. Step 5: Solve for x
    x = 161,497,839.62/12,991.68
  6. Step 6: Final answer
    x = 12,430.87

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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.