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Finding the Fourth Proportional to 18,890.94, 28,336.86 and 8,358.72

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Solution

The fourth proportional to 18,890.94, 28,336.86 and 8,358.72 is: 12,538.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,890.94 : 28,336.86 = 8,358.72 : x
  2. Step 2: Convert to fraction form
    18,890.94/28,336.86 = 8,358.72/x
  3. Step 3: Cross multiply
    18,890.94x = 28,336.86 × 8,358.72
  4. Step 4: Simplify right side
    18,890.94x = 236,859,878.42
  5. Step 5: Solve for x
    x = 236,859,878.42/18,890.94
  6. Step 6: Final answer
    x = 12,538.28

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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.