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Finding the Fourth Proportional to 18,765.77, 28,143.86 and 7,670.39

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Solution

The fourth proportional to 18,765.77, 28,143.86 and 7,670.39 is: 11,503.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.77 : 28,143.86 = 7,670.39 : x
  2. Step 2: Convert to fraction form
    18,765.77/28,143.86 = 7,670.39/x
  3. Step 3: Cross multiply
    18,765.77x = 28,143.86 × 7,670.39
  4. Step 4: Simplify right side
    18,765.77x = 215,874,203.23
  5. Step 5: Solve for x
    x = 215,874,203.23/18,765.77
  6. Step 6: Final answer
    x = 11,503.62

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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.