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Finding the Fourth Proportional to 128,604.88, 177,458.76 and 72,007.12

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Solution

The fourth proportional to 128,604.88, 177,458.76 and 72,007.12 is: 99,360.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,604.88 : 177,458.76 = 72,007.12 : x
  2. Step 2: Convert to fraction form
    128,604.88/177,458.76 = 72,007.12/x
  3. Step 3: Cross multiply
    128,604.88x = 177,458.76 × 72,007.12
  4. Step 4: Simplify right side
    128,604.88x = 12,778,294,226.37
  5. Step 5: Solve for x
    x = 12,778,294,226.37/128,604.88
  6. Step 6: Final answer
    x = 99,360.88

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1.5x scale

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.