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Finding the Fourth Proportional to 18,429.17, 27,642.95 and 8,428.12

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Solution

The fourth proportional to 18,429.17, 27,642.95 and 8,428.12 is: 12,641.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,429.17 : 27,642.95 = 8,428.12 : x
  2. Step 2: Convert to fraction form
    18,429.17/27,642.95 = 8,428.12/x
  3. Step 3: Cross multiply
    18,429.17x = 27,642.95 × 8,428.12
  4. Step 4: Simplify right side
    18,429.17x = 232,978,020.11
  5. Step 5: Solve for x
    x = 232,978,020.11/18,429.17
  6. Step 6: Final answer
    x = 12,641.81

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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.