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Finding the Fourth Proportional to 72,210.94, 99,651.40 and 40,379.82

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Solution

The fourth proportional to 72,210.94, 99,651.40 and 40,379.82 is: 55,724.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,210.94 : 99,651.40 = 40,379.82 : x
  2. Step 2: Convert to fraction form
    72,210.94/99,651.40 = 40,379.82/x
  3. Step 3: Cross multiply
    72,210.94x = 99,651.40 × 40,379.82
  4. Step 4: Simplify right side
    72,210.94x = 4,023,905,594.75
  5. Step 5: Solve for x
    x = 4,023,905,594.75/72,210.94
  6. Step 6: Final answer
    x = 55,724.32

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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.