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Finding the Fourth Proportional to 18,421.71, 27,633.92 and 7,881.45

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Solution

The fourth proportional to 18,421.71, 27,633.92 and 7,881.45 is: 11,822.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,421.71 : 27,633.92 = 7,881.45 : x
  2. Step 2: Convert to fraction form
    18,421.71/27,633.92 = 7,881.45/x
  3. Step 3: Cross multiply
    18,421.71x = 27,633.92 × 7,881.45
  4. Step 4: Simplify right side
    18,421.71x = 217,795,319.38
  5. Step 5: Solve for x
    x = 217,795,319.38/18,421.71
  6. Step 6: Final answer
    x = 11,822.75

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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.