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Finding the Fourth Proportional to 28,906.80, 43,411.40 and 21,124.40

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Solution

The fourth proportional to 28,906.80, 43,411.40 and 21,124.40 is: 31,724.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,906.80 : 43,411.40 = 21,124.40 : x
  2. Step 2: Convert to fraction form
    28,906.80/43,411.40 = 21,124.40/x
  3. Step 3: Cross multiply
    28,906.80x = 43,411.40 × 21,124.40
  4. Step 4: Simplify right side
    28,906.80x = 917,039,778.16
  5. Step 5: Solve for x
    x = 917,039,778.16/28,906.80
  6. Step 6: Final answer
    x = 31,724.02

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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.