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Finding the Fourth Proportional to 18,390.76, 27,561.90 and 7,291.39

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Solution

The fourth proportional to 18,390.76, 27,561.90 and 7,291.39 is: 10,927.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,390.76 : 27,561.90 = 7,291.39 : x
  2. Step 2: Convert to fraction form
    18,390.76/27,561.90 = 7,291.39/x
  3. Step 3: Cross multiply
    18,390.76x = 27,561.90 × 7,291.39
  4. Step 4: Simplify right side
    18,390.76x = 200,964,562.04
  5. Step 5: Solve for x
    x = 200,964,562.04/18,390.76
  6. Step 6: Final answer
    x = 10,927.47

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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.