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Finding the Fourth Proportional to 12,687.05, 17,501.09 and 7,381.28

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Solution

The fourth proportional to 12,687.05, 17,501.09 and 7,381.28 is: 10,182.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,687.05 : 17,501.09 = 7,381.28 : x
  2. Step 2: Convert to fraction form
    12,687.05/17,501.09 = 7,381.28/x
  3. Step 3: Cross multiply
    12,687.05x = 17,501.09 × 7,381.28
  4. Step 4: Simplify right side
    12,687.05x = 129,180,321.18
  5. Step 5: Solve for x
    x = 129,180,321.18/12,687.05
  6. Step 6: Final answer
    x = 10,182.07

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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.