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Finding the Fourth Proportional to 28,778.52, 43,173.64 and 12,138.52

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Solution

The fourth proportional to 28,778.52, 43,173.64 and 12,138.52 is: 18,210.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,778.52 : 43,173.64 = 12,138.52 : x
  2. Step 2: Convert to fraction form
    28,778.52/43,173.64 = 12,138.52/x
  3. Step 3: Cross multiply
    28,778.52x = 43,173.64 × 12,138.52
  4. Step 4: Simplify right side
    28,778.52x = 524,064,092.61
  5. Step 5: Solve for x
    x = 524,064,092.61/28,778.52
  6. Step 6: Final answer
    x = 18,210.25

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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.