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Finding the Fourth Proportional to 28,951.74, 39,967.02 and 21,784.32

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Solution

The fourth proportional to 28,951.74, 39,967.02 and 21,784.32 is: 30,072.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,951.74 : 39,967.02 = 21,784.32 : x
  2. Step 2: Convert to fraction form
    28,951.74/39,967.02 = 21,784.32/x
  3. Step 3: Cross multiply
    28,951.74x = 39,967.02 × 21,784.32
  4. Step 4: Simplify right side
    28,951.74x = 870,654,353.13
  5. Step 5: Solve for x
    x = 870,654,353.13/28,951.74
  6. Step 6: Final answer
    x = 30,072.61

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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.