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Finding the Fourth Proportional to 134,989.59, 186,287.60 and 78,400.97

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Solution

The fourth proportional to 134,989.59, 186,287.60 and 78,400.97 is: 108,194.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    134,989.59 : 186,287.60 = 78,400.97 : x
  2. Step 2: Convert to fraction form
    134,989.59/186,287.60 = 78,400.97/x
  3. Step 3: Cross multiply
    134,989.59x = 186,287.60 × 78,400.97
  4. Step 4: Simplify right side
    134,989.59x = 14,605,127,803.54
  5. Step 5: Solve for x
    x = 14,605,127,803.54/134,989.59
  6. Step 6: Final answer
    x = 108,194.47

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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.