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Finding the Fourth Proportional to 18,900, 28,382.40 and 17,915.04

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Solution

The fourth proportional to 18,900, 28,382.40 and 17,915.04 is: 26,903.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,900 : 28,382.40 = 17,915.04 : x
  2. Step 2: Convert to fraction form
    18,900/28,382.40 = 17,915.04/x
  3. Step 3: Cross multiply
    18,900x = 28,382.40 × 17,915.04
  4. Step 4: Simplify right side
    18,900x = 508,471,831.30
  5. Step 5: Solve for x
    x = 508,471,831.30/18,900
  6. Step 6: Final answer
    x = 26,903.27

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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.