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Finding the Fourth Proportional to 72,391.86, 99,904.85 and 40,571.01

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Solution

The fourth proportional to 72,391.86, 99,904.85 and 40,571.01 is: 55,990.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,391.86 : 99,904.85 = 40,571.01 : x
  2. Step 2: Convert to fraction form
    72,391.86/99,904.85 = 40,571.01/x
  3. Step 3: Cross multiply
    72,391.86x = 99,904.85 × 40,571.01
  4. Step 4: Simplify right side
    72,391.86x = 4,053,240,668.40
  5. Step 5: Solve for x
    x = 4,053,240,668.40/72,391.86
  6. Step 6: Final answer
    x = 55,990.28

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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.