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Finding the Fourth Proportional to 13,914.18, 20,881.61 and 8,656.83

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Solution

The fourth proportional to 13,914.18, 20,881.61 and 8,656.83 is: 12,991.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,914.18 : 20,881.61 = 8,656.83 : x
  2. Step 2: Convert to fraction form
    13,914.18/20,881.61 = 8,656.83/x
  3. Step 3: Cross multiply
    13,914.18x = 20,881.61 × 8,656.83
  4. Step 4: Simplify right side
    13,914.18x = 180,768,547.90
  5. Step 5: Solve for x
    x = 180,768,547.90/13,914.18
  6. Step 6: Final answer
    x = 12,991.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.