Home / 13,715.68-18,928.55-8,679.51

Finding the Fourth Proportional to 13,715.68, 18,928.55 and 8,679.51

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Solution

The fourth proportional to 13,715.68, 18,928.55 and 8,679.51 is: 11,978.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,715.68 : 18,928.55 = 8,679.51 : x
  2. Step 2: Convert to fraction form
    13,715.68/18,928.55 = 8,679.51/x
  3. Step 3: Cross multiply
    13,715.68x = 18,928.55 × 8,679.51
  4. Step 4: Simplify right side
    13,715.68x = 164,290,539.01
  5. Step 5: Solve for x
    x = 164,290,539.01/13,715.68
  6. Step 6: Final answer
    x = 11,978.30

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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.