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Finding the Fourth Proportional to 14,987.10, 20,682.87 and 8,615.75

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Solution

The fourth proportional to 14,987.10, 20,682.87 and 8,615.75 is: 11,890.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,987.10 : 20,682.87 = 8,615.75 : x
  2. Step 2: Convert to fraction form
    14,987.10/20,682.87 = 8,615.75/x
  3. Step 3: Cross multiply
    14,987.10x = 20,682.87 × 8,615.75
  4. Step 4: Simplify right side
    14,987.10x = 178,198,529.31
  5. Step 5: Solve for x
    x = 178,198,529.31/14,987.10
  6. Step 6: Final answer
    x = 11,890.13

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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.