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Finding the Fourth Proportional to 72,479.67, 108,714.64 and 19,884.75

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Solution

The fourth proportional to 72,479.67, 108,714.64 and 19,884.75 is: 29,825.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,479.67 : 108,714.64 = 19,884.75 : x
  2. Step 2: Convert to fraction form
    72,479.67/108,714.64 = 19,884.75/x
  3. Step 3: Cross multiply
    72,479.67x = 108,714.64 × 19,884.75
  4. Step 4: Simplify right side
    72,479.67x = 2,161,763,437.74
  5. Step 5: Solve for x
    x = 2,161,763,437.74/72,479.67
  6. Step 6: Final answer
    x = 29,825.79

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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.