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Finding the Fourth Proportional to 20,978.05, 28,950.39 and 12,027.24

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Solution

The fourth proportional to 20,978.05, 28,950.39 and 12,027.24 is: 16,597.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.05 : 28,950.39 = 12,027.24 : x
  2. Step 2: Convert to fraction form
    20,978.05/28,950.39 = 12,027.24/x
  3. Step 3: Cross multiply
    20,978.05x = 28,950.39 × 12,027.24
  4. Step 4: Simplify right side
    20,978.05x = 348,193,083.74
  5. Step 5: Solve for x
    x = 348,193,083.74/20,978.05
  6. Step 6: Final answer
    x = 16,597.98

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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.