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Finding the Fourth Proportional to 72,245.79, 99,695.18 and 40,408.54

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Solution

The fourth proportional to 72,245.79, 99,695.18 and 40,408.54 is: 55,761.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,245.79 : 99,695.18 = 40,408.54 : x
  2. Step 2: Convert to fraction form
    72,245.79/99,695.18 = 40,408.54/x
  3. Step 3: Cross multiply
    72,245.79x = 99,695.18 × 40,408.54
  4. Step 4: Simplify right side
    72,245.79x = 4,028,536,419.60
  5. Step 5: Solve for x
    x = 4,028,536,419.60/72,245.79
  6. Step 6: Final answer
    x = 55,761.54

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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.