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Finding the Fourth Proportional to 128,804.86, 192,957.10 and 72,473.20

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Solution

The fourth proportional to 128,804.86, 192,957.10 and 72,473.20 is: 108,569.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,804.86 : 192,957.10 = 72,473.20 : x
  2. Step 2: Convert to fraction form
    128,804.86/192,957.10 = 72,473.20/x
  3. Step 3: Cross multiply
    128,804.86x = 192,957.10 × 72,473.20
  4. Step 4: Simplify right side
    128,804.86x = 13,984,218,499.72
  5. Step 5: Solve for x
    x = 13,984,218,499.72/128,804.86
  6. Step 6: Final answer
    x = 108,569.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.