Home / 28,206.72-38,928-15,634.56

Finding the Fourth Proportional to 28,206.72, 38,928 and 15,634.56

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Solution

The fourth proportional to 28,206.72, 38,928 and 15,634.56 is: 21,577.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,206.72 : 38,928 = 15,634.56 : x
  2. Step 2: Convert to fraction form
    28,206.72/38,928 = 15,634.56/x
  3. Step 3: Cross multiply
    28,206.72x = 38,928 × 15,634.56
  4. Step 4: Simplify right side
    28,206.72x = 608,622,151.68
  5. Step 5: Solve for x
    x = 608,622,151.68/28,206.72
  6. Step 6: Final answer
    x = 21,577.20

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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.