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Finding the Fourth Proportional to 118,309.76, 177,285.07 and 86,740.84

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Solution

The fourth proportional to 118,309.76, 177,285.07 and 86,740.84 is: 129,979.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,309.76 : 177,285.07 = 86,740.84 : x
  2. Step 2: Convert to fraction form
    118,309.76/177,285.07 = 86,740.84/x
  3. Step 3: Cross multiply
    118,309.76x = 177,285.07 × 86,740.84
  4. Step 4: Simplify right side
    118,309.76x = 15,377,855,224.06
  5. Step 5: Solve for x
    x = 15,377,855,224.06/118,309.76
  6. Step 6: Final answer
    x = 129,979.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.