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Finding the Fourth Proportional to 128,751.19, 177,678.79 and 71,392.93

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Solution

The fourth proportional to 128,751.19, 177,678.79 and 71,392.93 is: 98,523.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,751.19 : 177,678.79 = 71,392.93 : x
  2. Step 2: Convert to fraction form
    128,751.19/177,678.79 = 71,392.93/x
  3. Step 3: Cross multiply
    128,751.19x = 177,678.79 × 71,392.93
  4. Step 4: Simplify right side
    128,751.19x = 12,685,008,794.28
  5. Step 5: Solve for x
    x = 12,685,008,794.28/128,751.19
  6. Step 6: Final answer
    x = 98,523.43

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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.