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Finding the Fourth Proportional to 28,551, 39,400.38 and 15,978.72

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Solution

The fourth proportional to 28,551, 39,400.38 and 15,978.72 is: 22,050.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,551 : 39,400.38 = 15,978.72 : x
  2. Step 2: Convert to fraction form
    28,551/39,400.38 = 15,978.72/x
  3. Step 3: Cross multiply
    28,551x = 39,400.38 × 15,978.72
  4. Step 4: Simplify right side
    28,551x = 629,567,639.91
  5. Step 5: Solve for x
    x = 629,567,639.91/28,551
  6. Step 6: Final answer
    x = 22,050.63

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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.