Home / 28,724.40-39,628.36-21,188.88

Finding the Fourth Proportional to 28,724.40, 39,628.36 and 21,188.88

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Solution

The fourth proportional to 28,724.40, 39,628.36 and 21,188.88 is: 29,232.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,724.40 : 39,628.36 = 21,188.88 : x
  2. Step 2: Convert to fraction form
    28,724.40/39,628.36 = 21,188.88/x
  3. Step 3: Cross multiply
    28,724.40x = 39,628.36 × 21,188.88
  4. Step 4: Simplify right side
    28,724.40x = 839,680,564.64
  5. Step 5: Solve for x
    x = 839,680,564.64/28,724.40
  6. Step 6: Final answer
    x = 29,232.31

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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.