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Finding the Fourth Proportional to 278,370.92, 417,556.38 and 81,378.92

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Solution

The fourth proportional to 278,370.92, 417,556.38 and 81,378.92 is: 122,068.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,370.92 : 417,556.38 = 81,378.92 : x
  2. Step 2: Convert to fraction form
    278,370.92/417,556.38 = 81,378.92/x
  3. Step 3: Cross multiply
    278,370.92x = 417,556.38 × 81,378.92
  4. Step 4: Simplify right side
    278,370.92x = 33,980,287,243.51
  5. Step 5: Solve for x
    x = 33,980,287,243.51/278,370.92
  6. Step 6: Final answer
    x = 122,068.38

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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.