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Finding the Fourth Proportional to 79,740.40, 119,788.80 and 66,618.40

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Solution

The fourth proportional to 79,740.40, 119,788.80 and 66,618.40 is: 100,076.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,740.40 : 119,788.80 = 66,618.40 : x
  2. Step 2: Convert to fraction form
    79,740.40/119,788.80 = 66,618.40/x
  3. Step 3: Cross multiply
    79,740.40x = 119,788.80 × 66,618.40
  4. Step 4: Simplify right side
    79,740.40x = 7,980,138,193.92
  5. Step 5: Solve for x
    x = 7,980,138,193.92/79,740.40
  6. Step 6: Final answer
    x = 100,076.48

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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.