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Finding the Fourth Proportional to 51,720, 71,373.60 and 28,168

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Solution

The fourth proportional to 51,720, 71,373.60 and 28,168 is: 38,871.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,720 : 71,373.60 = 28,168 : x
  2. Step 2: Convert to fraction form
    51,720/71,373.60 = 28,168/x
  3. Step 3: Cross multiply
    51,720x = 71,373.60 × 28,168
  4. Step 4: Simplify right side
    51,720x = 2,010,451,564.80
  5. Step 5: Solve for x
    x = 2,010,451,564.80/51,720
  6. Step 6: Final answer
    x = 38,871.84

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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.