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Finding the Fourth Proportional to 13,461.59, 20,143.18 and 7,917.55

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Solution

The fourth proportional to 13,461.59, 20,143.18 and 7,917.55 is: 11,847.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,461.59 : 20,143.18 = 7,917.55 : x
  2. Step 2: Convert to fraction form
    13,461.59/20,143.18 = 7,917.55/x
  3. Step 3: Cross multiply
    13,461.59x = 20,143.18 × 7,917.55
  4. Step 4: Simplify right side
    13,461.59x = 159,484,594.35
  5. Step 5: Solve for x
    x = 159,484,594.35/13,461.59
  6. Step 6: Final answer
    x = 11,847.38

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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.