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Finding the Fourth Proportional to 72,187.88, 99,622.37 and 40,356.77

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Solution

The fourth proportional to 72,187.88, 99,622.37 and 40,356.77 is: 55,694.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,187.88 : 99,622.37 = 40,356.77 : x
  2. Step 2: Convert to fraction form
    72,187.88/99,622.37 = 40,356.77/x
  3. Step 3: Cross multiply
    72,187.88x = 99,622.37 × 40,356.77
  4. Step 4: Simplify right side
    72,187.88x = 4,020,437,072.94
  5. Step 5: Solve for x
    x = 4,020,437,072.94/72,187.88
  6. Step 6: Final answer
    x = 55,694.07

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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.