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Finding the Fourth Proportional to 72,230.81, 99,687.92 and 40,406.31

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Solution

The fourth proportional to 72,230.81, 99,687.92 and 40,406.31 is: 55,765.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,230.81 : 99,687.92 = 40,406.31 : x
  2. Step 2: Convert to fraction form
    72,230.81/99,687.92 = 40,406.31/x
  3. Step 3: Cross multiply
    72,230.81x = 99,687.92 × 40,406.31
  4. Step 4: Simplify right side
    72,230.81x = 4,028,020,796.74
  5. Step 5: Solve for x
    x = 4,028,020,796.74/72,230.81
  6. Step 6: Final answer
    x = 55,765.97

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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.