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Finding the Fourth Proportional to 13,654.60, 18,838.68 and 8,278.68

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Solution

The fourth proportional to 13,654.60, 18,838.68 and 8,278.68 is: 11,421.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,654.60 : 18,838.68 = 8,278.68 : x
  2. Step 2: Convert to fraction form
    13,654.60/18,838.68 = 8,278.68/x
  3. Step 3: Cross multiply
    13,654.60x = 18,838.68 × 8,278.68
  4. Step 4: Simplify right side
    13,654.60x = 155,959,403.34
  5. Step 5: Solve for x
    x = 155,959,403.34/13,654.60
  6. Step 6: Final answer
    x = 11,421.75

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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.