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Finding the Fourth Proportional to 111,207.80, 166,811.70 and 71,809.40

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Solution

The fourth proportional to 111,207.80, 166,811.70 and 71,809.40 is: 107,714.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,207.80 : 166,811.70 = 71,809.40 : x
  2. Step 2: Convert to fraction form
    111,207.80/166,811.70 = 71,809.40/x
  3. Step 3: Cross multiply
    111,207.80x = 166,811.70 × 71,809.40
  4. Step 4: Simplify right side
    111,207.80x = 11,978,648,089.98
  5. Step 5: Solve for x
    x = 11,978,648,089.98/111,207.80
  6. Step 6: Final answer
    x = 107,714.10

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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.