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Finding the Fourth Proportional to 13,654.74, 18,848.64 and 7,991.28

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Solution

The fourth proportional to 13,654.74, 18,848.64 and 7,991.28 is: 11,030.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,654.74 : 18,848.64 = 7,991.28 : x
  2. Step 2: Convert to fraction form
    13,654.74/18,848.64 = 7,991.28/x
  3. Step 3: Cross multiply
    13,654.74x = 18,848.64 × 7,991.28
  4. Step 4: Simplify right side
    13,654.74x = 150,624,759.86
  5. Step 5: Solve for x
    x = 150,624,759.86/13,654.74
  6. Step 6: Final answer
    x = 11,030.95

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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.