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Finding the Fourth Proportional to 18,485.40, 27,689.10 and 12,248.40

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Solution

The fourth proportional to 18,485.40, 27,689.10 and 12,248.40 is: 18,346.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,485.40 : 27,689.10 = 12,248.40 : x
  2. Step 2: Convert to fraction form
    18,485.40/27,689.10 = 12,248.40/x
  3. Step 3: Cross multiply
    18,485.40x = 27,689.10 × 12,248.40
  4. Step 4: Simplify right side
    18,485.40x = 339,147,172.44
  5. Step 5: Solve for x
    x = 339,147,172.44/18,485.40
  6. Step 6: Final answer
    x = 18,346.76

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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.