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Finding the Fourth Proportional to 72,309.65, 99,786.21 and 40,479.68

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Solution

The fourth proportional to 72,309.65, 99,786.21 and 40,479.68 is: 55,861.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,309.65 : 99,786.21 = 40,479.68 : x
  2. Step 2: Convert to fraction form
    72,309.65/99,786.21 = 40,479.68/x
  3. Step 3: Cross multiply
    72,309.65x = 99,786.21 × 40,479.68
  4. Step 4: Simplify right side
    72,309.65x = 4,039,313,350.28
  5. Step 5: Solve for x
    x = 4,039,313,350.28/72,309.65
  6. Step 6: Final answer
    x = 55,861.34

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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.