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Finding the Fourth Proportional to 128,903.75, 177,884.51 and 71,539.74

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Solution

The fourth proportional to 128,903.75, 177,884.51 and 71,539.74 is: 98,723.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,903.75 : 177,884.51 = 71,539.74 : x
  2. Step 2: Convert to fraction form
    128,903.75/177,884.51 = 71,539.74/x
  3. Step 3: Cross multiply
    128,903.75x = 177,884.51 × 71,539.74
  4. Step 4: Simplify right side
    128,903.75x = 12,725,811,237.73
  5. Step 5: Solve for x
    x = 12,725,811,237.73/128,903.75
  6. Step 6: Final answer
    x = 98,723.36

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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.