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Finding the Fourth Proportional to 13,687.68, 18,888.72 and 7,719.84

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Solution

The fourth proportional to 13,687.68, 18,888.72 and 7,719.84 is: 10,653.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687.68 : 18,888.72 = 7,719.84 : x
  2. Step 2: Convert to fraction form
    13,687.68/18,888.72 = 7,719.84/x
  3. Step 3: Cross multiply
    13,687.68x = 18,888.72 × 7,719.84
  4. Step 4: Simplify right side
    13,687.68x = 145,817,896.20
  5. Step 5: Solve for x
    x = 145,817,896.20/13,687.68
  6. Step 6: Final answer
    x = 10,653.22

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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.