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Finding the Fourth Proportional to 18,679.42, 27,811.76 and 18,417.90

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Solution

The fourth proportional to 18,679.42, 27,811.76 and 18,417.90 is: 27,422.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,679.42 : 27,811.76 = 18,417.90 : x
  2. Step 2: Convert to fraction form
    18,679.42/27,811.76 = 18,417.90/x
  3. Step 3: Cross multiply
    18,679.42x = 27,811.76 × 18,417.90
  4. Step 4: Simplify right side
    18,679.42x = 512,234,214.50
  5. Step 5: Solve for x
    x = 512,234,214.50/18,679.42
  6. Step 6: Final answer
    x = 27,422.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.