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Finding the Fourth Proportional to 28,724.80, 43,087.20 and 21,812.80

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Solution

The fourth proportional to 28,724.80, 43,087.20 and 21,812.80 is: 32,719.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,724.80 : 43,087.20 = 21,812.80 : x
  2. Step 2: Convert to fraction form
    28,724.80/43,087.20 = 21,812.80/x
  3. Step 3: Cross multiply
    28,724.80x = 43,087.20 × 21,812.80
  4. Step 4: Simplify right side
    28,724.80x = 939,852,476.16
  5. Step 5: Solve for x
    x = 939,852,476.16/28,724.80
  6. Step 6: Final answer
    x = 32,719.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.