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Finding the Fourth Proportional to 100,793.09, 139,100.19 and 57,779.73

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Solution

The fourth proportional to 100,793.09, 139,100.19 and 57,779.73 is: 79,739.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,793.09 : 139,100.19 = 57,779.73 : x
  2. Step 2: Convert to fraction form
    100,793.09/139,100.19 = 57,779.73/x
  3. Step 3: Cross multiply
    100,793.09x = 139,100.19 × 57,779.73
  4. Step 4: Simplify right side
    100,793.09x = 8,037,171,421.15
  5. Step 5: Solve for x
    x = 8,037,171,421.15/100,793.09
  6. Step 6: Final answer
    x = 79,739.31

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1.5x scale

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.