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Finding the Fourth Proportional to 128,458.71, 177,277.82 and 71,870.49

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Solution

The fourth proportional to 128,458.71, 177,277.82 and 71,870.49 is: 99,183.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,458.71 : 177,277.82 = 71,870.49 : x
  2. Step 2: Convert to fraction form
    128,458.71/177,277.82 = 71,870.49/x
  3. Step 3: Cross multiply
    128,458.71x = 177,277.82 × 71,870.49
  4. Step 4: Simplify right side
    128,458.71x = 12,741,043,430.18
  5. Step 5: Solve for x
    x = 12,741,043,430.18/128,458.71
  6. Step 6: Final answer
    x = 99,183.96

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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.