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Finding the Fourth Proportional to 278,806.85, 418,208.45 and 79,127.36

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Solution

The fourth proportional to 278,806.85, 418,208.45 and 79,127.36 is: 118,690.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,806.85 : 418,208.45 = 79,127.36 : x
  2. Step 2: Convert to fraction form
    278,806.85/418,208.45 = 79,127.36/x
  3. Step 3: Cross multiply
    278,806.85x = 418,208.45 × 79,127.36
  4. Step 4: Simplify right side
    278,806.85x = 33,091,728,091.51
  5. Step 5: Solve for x
    x = 33,091,728,091.51/278,806.85
  6. Step 6: Final answer
    x = 118,690.52

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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.