Home / 20,516.89-28,285.88-15,390.61

Finding the Fourth Proportional to 20,516.89, 28,285.88 and 15,390.61

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Solution

The fourth proportional to 20,516.89, 28,285.88 and 15,390.61 is: 21,218.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,516.89 : 28,285.88 = 15,390.61 : x
  2. Step 2: Convert to fraction form
    20,516.89/28,285.88 = 15,390.61/x
  3. Step 3: Cross multiply
    20,516.89x = 28,285.88 × 15,390.61
  4. Step 4: Simplify right side
    20,516.89x = 435,336,947.59
  5. Step 5: Solve for x
    x = 435,336,947.59/20,516.89
  6. Step 6: Final answer
    x = 21,218.47

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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.