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Finding the Fourth Proportional to 278,808.62, 418,212.45 and 79,130.93

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Solution

The fourth proportional to 278,808.62, 418,212.45 and 79,130.93 is: 118,696.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,808.62 : 418,212.45 = 79,130.93 : x
  2. Step 2: Convert to fraction form
    278,808.62/418,212.45 = 79,130.93/x
  3. Step 3: Cross multiply
    278,808.62x = 418,212.45 × 79,130.93
  4. Step 4: Simplify right side
    278,808.62x = 33,093,538,015.02
  5. Step 5: Solve for x
    x = 33,093,538,015.02/278,808.62
  6. Step 6: Final answer
    x = 118,696.25

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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.