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Finding the Fourth Proportional to 128,803.86, 192,955.60 and 72,472.20

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Solution

The fourth proportional to 128,803.86, 192,955.60 and 72,472.20 is: 108,567.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,803.86 : 192,955.60 = 72,472.20 : x
  2. Step 2: Convert to fraction form
    128,803.86/192,955.60 = 72,472.20/x
  3. Step 3: Cross multiply
    128,803.86x = 192,955.60 × 72,472.20
  4. Step 4: Simplify right side
    128,803.86x = 13,983,916,834.32
  5. Step 5: Solve for x
    x = 13,983,916,834.32/128,803.86
  6. Step 6: Final answer
    x = 108,567.53

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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.