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Finding the Fourth Proportional to 84,139.60, 126,055.80 and 51,269.20

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Solution

The fourth proportional to 84,139.60, 126,055.80 and 51,269.20 is: 76,810.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,139.60 : 126,055.80 = 51,269.20 : x
  2. Step 2: Convert to fraction form
    84,139.60/126,055.80 = 51,269.20/x
  3. Step 3: Cross multiply
    84,139.60x = 126,055.80 × 51,269.20
  4. Step 4: Simplify right side
    84,139.60x = 6,462,780,021.36
  5. Step 5: Solve for x
    x = 6,462,780,021.36/84,139.60
  6. Step 6: Final answer
    x = 76,810.21

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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.