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Finding the Fourth Proportional to 43,920.54, 65,864.79 and 18,949.86

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Solution

The fourth proportional to 43,920.54, 65,864.79 and 18,949.86 is: 28,417.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,920.54 : 65,864.79 = 18,949.86 : x
  2. Step 2: Convert to fraction form
    43,920.54/65,864.79 = 18,949.86/x
  3. Step 3: Cross multiply
    43,920.54x = 65,864.79 × 18,949.86
  4. Step 4: Simplify right side
    43,920.54x = 1,248,128,549.43
  5. Step 5: Solve for x
    x = 1,248,128,549.43/43,920.54
  6. Step 6: Final answer
    x = 28,417.88

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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.