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Finding the Fourth Proportional to 12,905.51, 17,812.44 and 8,188.88

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Solution

The fourth proportional to 12,905.51, 17,812.44 and 8,188.88 is: 11,302.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905.51 : 17,812.44 = 8,188.88 : x
  2. Step 2: Convert to fraction form
    12,905.51/17,812.44 = 8,188.88/x
  3. Step 3: Cross multiply
    12,905.51x = 17,812.44 × 8,188.88
  4. Step 4: Simplify right side
    12,905.51x = 145,863,844.61
  5. Step 5: Solve for x
    x = 145,863,844.61/12,905.51
  6. Step 6: Final answer
    x = 11,302.45

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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.