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Finding the Fourth Proportional to 18,312.54, 27,447.53 and 8,431.06

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Solution

The fourth proportional to 18,312.54, 27,447.53 and 8,431.06 is: 12,636.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,312.54 : 27,447.53 = 8,431.06 : x
  2. Step 2: Convert to fraction form
    18,312.54/27,447.53 = 8,431.06/x
  3. Step 3: Cross multiply
    18,312.54x = 27,447.53 × 8,431.06
  4. Step 4: Simplify right side
    18,312.54x = 231,411,687.61
  5. Step 5: Solve for x
    x = 231,411,687.61/18,312.54
  6. Step 6: Final answer
    x = 12,636.79

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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.