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Finding the Fourth Proportional to 84,854.60, 126,661.56 and 78,687.08

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Solution

The fourth proportional to 84,854.60, 126,661.56 and 78,687.08 is: 117,455.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,854.60 : 126,661.56 = 78,687.08 : x
  2. Step 2: Convert to fraction form
    84,854.60/126,661.56 = 78,687.08/x
  3. Step 3: Cross multiply
    84,854.60x = 126,661.56 × 78,687.08
  4. Step 4: Simplify right side
    84,854.60x = 9,966,628,304.64
  5. Step 5: Solve for x
    x = 9,966,628,304.64/84,854.60
  6. Step 6: Final answer
    x = 117,455.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.