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Finding the Fourth Proportional to 8,687.15, 11,985.03 and 5,704.64

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Solution

The fourth proportional to 8,687.15, 11,985.03 and 5,704.64 is: 7,870.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.15 : 11,985.03 = 5,704.64 : x
  2. Step 2: Convert to fraction form
    8,687.15/11,985.03 = 5,704.64/x
  3. Step 3: Cross multiply
    8,687.15x = 11,985.03 × 5,704.64
  4. Step 4: Simplify right side
    8,687.15x = 68,370,281.54
  5. Step 5: Solve for x
    x = 68,370,281.54/8,687.15
  6. Step 6: Final answer
    x = 7,870.28

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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.