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Finding the Fourth Proportional to 18,876.65, 28,336.84 and 10,128.65

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Solution

The fourth proportional to 18,876.65, 28,336.84 and 10,128.65 is: 15,204.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,876.65 : 28,336.84 = 10,128.65 : x
  2. Step 2: Convert to fraction form
    18,876.65/28,336.84 = 10,128.65/x
  3. Step 3: Cross multiply
    18,876.65x = 28,336.84 × 10,128.65
  4. Step 4: Simplify right side
    18,876.65x = 287,013,934.47
  5. Step 5: Solve for x
    x = 287,013,934.47/18,876.65
  6. Step 6: Final answer
    x = 15,204.71

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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.