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Finding the Fourth Proportional to 128,770.83, 177,698.79 and 71,412.51

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Solution

The fourth proportional to 128,770.83, 177,698.79 and 71,412.51 is: 98,546.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,770.83 : 177,698.79 = 71,412.51 : x
  2. Step 2: Convert to fraction form
    128,770.83/177,698.79 = 71,412.51/x
  3. Step 3: Cross multiply
    128,770.83x = 177,698.79 × 71,412.51
  4. Step 4: Simplify right side
    128,770.83x = 12,689,916,617.86
  5. Step 5: Solve for x
    x = 12,689,916,617.86/128,770.83
  6. Step 6: Final answer
    x = 98,546.52

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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.