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Finding the Fourth Proportional to 278,868.99, 418,219.65 and 79,205.61

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Solution

The fourth proportional to 278,868.99, 418,219.65 and 79,205.61 is: 118,784.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,868.99 : 418,219.65 = 79,205.61 : x
  2. Step 2: Convert to fraction form
    278,868.99/418,219.65 = 79,205.61/x
  3. Step 3: Cross multiply
    278,868.99x = 418,219.65 × 79,205.61
  4. Step 4: Simplify right side
    278,868.99x = 33,125,342,492.24
  5. Step 5: Solve for x
    x = 33,125,342,492.24/278,868.99
  6. Step 6: Final answer
    x = 118,784.60

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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.