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Finding the Fourth Proportional to 28,393.62, 39,180.15 and 15,815.94

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Solution

The fourth proportional to 28,393.62, 39,180.15 and 15,815.94 is: 21,824.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,393.62 : 39,180.15 = 15,815.94 : x
  2. Step 2: Convert to fraction form
    28,393.62/39,180.15 = 15,815.94/x
  3. Step 3: Cross multiply
    28,393.62x = 39,180.15 × 15,815.94
  4. Step 4: Simplify right side
    28,393.62x = 619,670,901.59
  5. Step 5: Solve for x
    x = 619,670,901.59/28,393.62
  6. Step 6: Final answer
    x = 21,824.30

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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.