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Finding the Fourth Proportional to 8,699.10, 11,991.30 and 7,287.54

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Solution

The fourth proportional to 8,699.10, 11,991.30 and 7,287.54 is: 10,045.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,699.10 : 11,991.30 = 7,287.54 : x
  2. Step 2: Convert to fraction form
    8,699.10/11,991.30 = 7,287.54/x
  3. Step 3: Cross multiply
    8,699.10x = 11,991.30 × 7,287.54
  4. Step 4: Simplify right side
    8,699.10x = 87,387,078.40
  5. Step 5: Solve for x
    x = 87,387,078.40/8,699.10
  6. Step 6: Final answer
    x = 10,045.53

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1.5x scale

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.