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Finding the Fourth Proportional to 71,808.20, 107,712.30 and 40,704.20

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Solution

The fourth proportional to 71,808.20, 107,712.30 and 40,704.20 is: 61,056.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,808.20 : 107,712.30 = 40,704.20 : x
  2. Step 2: Convert to fraction form
    71,808.20/107,712.30 = 40,704.20/x
  3. Step 3: Cross multiply
    71,808.20x = 107,712.30 × 40,704.20
  4. Step 4: Simplify right side
    71,808.20x = 4,384,343,001.66
  5. Step 5: Solve for x
    x = 4,384,343,001.66/71,808.20
  6. Step 6: Final answer
    x = 61,056.30

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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.