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Finding the Fourth Proportional to 14,919.80, 20,587.71 and 8,631

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Solution

The fourth proportional to 14,919.80, 20,587.71 and 8,631 is: 11,909.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,919.80 : 20,587.71 = 8,631 : x
  2. Step 2: Convert to fraction form
    14,919.80/20,587.71 = 8,631/x
  3. Step 3: Cross multiply
    14,919.80x = 20,587.71 × 8,631
  4. Step 4: Simplify right side
    14,919.80x = 177,692,525.01
  5. Step 5: Solve for x
    x = 177,692,525.01/14,919.80
  6. Step 6: Final answer
    x = 11,909.85

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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.