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Finding the Fourth Proportional to 20,930.76, 28,856.52 and 17,933.76

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Solution

The fourth proportional to 20,930.76, 28,856.52 and 17,933.76 is: 24,724.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.76 : 28,856.52 = 17,933.76 : x
  2. Step 2: Convert to fraction form
    20,930.76/28,856.52 = 17,933.76/x
  3. Step 3: Cross multiply
    20,930.76x = 28,856.52 × 17,933.76
  4. Step 4: Simplify right side
    20,930.76x = 517,505,904.12
  5. Step 5: Solve for x
    x = 517,505,904.12/20,930.76
  6. Step 6: Final answer
    x = 24,724.66

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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.