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Finding the Fourth Proportional to 278,812.67, 418,218.21 and 79,133.24

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Solution

The fourth proportional to 278,812.67, 418,218.21 and 79,133.24 is: 118,699.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,812.67 : 418,218.21 = 79,133.24 : x
  2. Step 2: Convert to fraction form
    278,812.67/418,218.21 = 79,133.24/x
  3. Step 3: Cross multiply
    278,812.67x = 418,218.21 × 79,133.24
  4. Step 4: Simplify right side
    278,812.67x = 33,094,963,029.85
  5. Step 5: Solve for x
    x = 33,094,963,029.85/278,812.67
  6. Step 6: Final answer
    x = 118,699.64

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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.