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Finding the Fourth Proportional to 8,515, 11,751.30 and 4,789

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Solution

The fourth proportional to 8,515, 11,751.30 and 4,789 is: 6,609.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,515 : 11,751.30 = 4,789 : x
  2. Step 2: Convert to fraction form
    8,515/11,751.30 = 4,789/x
  3. Step 3: Cross multiply
    8,515x = 11,751.30 × 4,789
  4. Step 4: Simplify right side
    8,515x = 56,276,975.70
  5. Step 5: Solve for x
    x = 56,276,975.70/8,515
  6. Step 6: Final answer
    x = 6,609.16

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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.