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Finding the Fourth Proportional to 128,303.61, 177,055.52 and 71,725.92

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Solution

The fourth proportional to 128,303.61, 177,055.52 and 71,725.92 is: 98,979.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,303.61 : 177,055.52 = 71,725.92 : x
  2. Step 2: Convert to fraction form
    128,303.61/177,055.52 = 71,725.92/x
  3. Step 3: Cross multiply
    128,303.61x = 177,055.52 × 71,725.92
  4. Step 4: Simplify right side
    128,303.61x = 12,699,469,704.45
  5. Step 5: Solve for x
    x = 12,699,469,704.45/128,303.61
  6. Step 6: Final answer
    x = 98,979.83

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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.