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Finding the Fourth Proportional to 10,085, 15,127.50 and 2,789

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Solution

The fourth proportional to 10,085, 15,127.50 and 2,789 is: 4,183.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,085 : 15,127.50 = 2,789 : x
  2. Step 2: Convert to fraction form
    10,085/15,127.50 = 2,789/x
  3. Step 3: Cross multiply
    10,085x = 15,127.50 × 2,789
  4. Step 4: Simplify right side
    10,085x = 42,190,597.50
  5. Step 5: Solve for x
    x = 42,190,597.50/10,085
  6. Step 6: Final answer
    x = 4,183.50

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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.