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Finding the Fourth Proportional to 18,479.55, 27,720.44 and 12,553.93

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Solution

The fourth proportional to 18,479.55, 27,720.44 and 12,553.93 is: 18,831.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,479.55 : 27,720.44 = 12,553.93 : x
  2. Step 2: Convert to fraction form
    18,479.55/27,720.44 = 12,553.93/x
  3. Step 3: Cross multiply
    18,479.55x = 27,720.44 × 12,553.93
  4. Step 4: Simplify right side
    18,479.55x = 348,000,494.71
  5. Step 5: Solve for x
    x = 348,000,494.71/18,479.55
  6. Step 6: Final answer
    x = 18,831.65

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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.