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Finding the Fourth Proportional to 28,591.80, 42,890.55 and 11,957.04

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Solution

The fourth proportional to 28,591.80, 42,890.55 and 11,957.04 is: 17,936.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,591.80 : 42,890.55 = 11,957.04 : x
  2. Step 2: Convert to fraction form
    28,591.80/42,890.55 = 11,957.04/x
  3. Step 3: Cross multiply
    28,591.80x = 42,890.55 × 11,957.04
  4. Step 4: Simplify right side
    28,591.80x = 512,844,021.97
  5. Step 5: Solve for x
    x = 512,844,021.97/28,591.80
  6. Step 6: Final answer
    x = 17,936.75

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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.