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Finding the Fourth Proportional to 72,777.87, 109,166.80 and 20,187.35

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Solution

The fourth proportional to 72,777.87, 109,166.80 and 20,187.35 is: 30,281.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,777.87 : 109,166.80 = 20,187.35 : x
  2. Step 2: Convert to fraction form
    72,777.87/109,166.80 = 20,187.35/x
  3. Step 3: Cross multiply
    72,777.87x = 109,166.80 × 20,187.35
  4. Step 4: Simplify right side
    72,777.87x = 2,203,788,586.32
  5. Step 5: Solve for x
    x = 2,203,788,586.32/72,777.87
  6. Step 6: Final answer
    x = 30,281.03

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1.5x scale

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.