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Finding the Fourth Proportional to 79,430.80, 119,243.40 and 78,847.60

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Solution

The fourth proportional to 79,430.80, 119,243.40 and 78,847.60 is: 118,367.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,430.80 : 119,243.40 = 78,847.60 : x
  2. Step 2: Convert to fraction form
    79,430.80/119,243.40 = 78,847.60/x
  3. Step 3: Cross multiply
    79,430.80x = 119,243.40 × 78,847.60
  4. Step 4: Simplify right side
    79,430.80x = 9,402,055,905.84
  5. Step 5: Solve for x
    x = 9,402,055,905.84/79,430.80
  6. Step 6: Final answer
    x = 118,367.89

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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.