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Finding the Fourth Proportional to 278,992.82, 385,012.85 and 151,671.15

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Solution

The fourth proportional to 278,992.82, 385,012.85 and 151,671.15 is: 209,307.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,992.82 : 385,012.85 = 151,671.15 : x
  2. Step 2: Convert to fraction form
    278,992.82/385,012.85 = 151,671.15/x
  3. Step 3: Cross multiply
    278,992.82x = 385,012.85 × 151,671.15
  4. Step 4: Simplify right side
    278,992.82x = 58,395,340,965.92
  5. Step 5: Solve for x
    x = 58,395,340,965.92/278,992.82
  6. Step 6: Final answer
    x = 209,307.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.