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Finding the Fourth Proportional to 403,236.80, 604,855.20 and 285,138.80

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Solution

The fourth proportional to 403,236.80, 604,855.20 and 285,138.80 is: 427,708.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,236.80 : 604,855.20 = 285,138.80 : x
  2. Step 2: Convert to fraction form
    403,236.80/604,855.20 = 285,138.80/x
  3. Step 3: Cross multiply
    403,236.80x = 604,855.20 × 285,138.80
  4. Step 4: Simplify right side
    403,236.80x = 172,467,685,901.76
  5. Step 5: Solve for x
    x = 172,467,685,901.76/403,236.80
  6. Step 6: Final answer
    x = 427,708.20

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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.