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Finding the Fourth Proportional to 72,405.71, 99,919.81 and 40,574.84

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Solution

The fourth proportional to 72,405.71, 99,919.81 and 40,574.84 is: 55,993.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,405.71 : 99,919.81 = 40,574.84 : x
  2. Step 2: Convert to fraction form
    72,405.71/99,919.81 = 40,574.84/x
  3. Step 3: Cross multiply
    72,405.71x = 99,919.81 × 40,574.84
  4. Step 4: Simplify right side
    72,405.71x = 4,054,229,854.70
  5. Step 5: Solve for x
    x = 4,054,229,854.70/72,405.71
  6. Step 6: Final answer
    x = 55,993.23

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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.