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Finding the Fourth Proportional to 21,000.39, 31,500.60 and 7,149.39

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Solution

The fourth proportional to 21,000.39, 31,500.60 and 7,149.39 is: 10,724.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.39 : 31,500.60 = 7,149.39 : x
  2. Step 2: Convert to fraction form
    21,000.39/31,500.60 = 7,149.39/x
  3. Step 3: Cross multiply
    21,000.39x = 31,500.60 × 7,149.39
  4. Step 4: Simplify right side
    21,000.39x = 225,210,074.63
  5. Step 5: Solve for x
    x = 225,210,074.63/21,000.39
  6. Step 6: Final answer
    x = 10,724.09

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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.