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Finding the Fourth Proportional to 57,811.80, 79,779.80 and 40,608.36

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Solution

The fourth proportional to 57,811.80, 79,779.80 and 40,608.36 is: 56,039.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,811.80 : 79,779.80 = 40,608.36 : x
  2. Step 2: Convert to fraction form
    57,811.80/79,779.80 = 40,608.36/x
  3. Step 3: Cross multiply
    57,811.80x = 79,779.80 × 40,608.36
  4. Step 4: Simplify right side
    57,811.80x = 3,239,726,839.13
  5. Step 5: Solve for x
    x = 3,239,726,839.13/57,811.80
  6. Step 6: Final answer
    x = 56,039.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.