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Finding the Fourth Proportional to 503,780.20, 755,670.30 and 389,618.80

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Solution

The fourth proportional to 503,780.20, 755,670.30 and 389,618.80 is: 584,428.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    503,780.20 : 755,670.30 = 389,618.80 : x
  2. Step 2: Convert to fraction form
    503,780.20/755,670.30 = 389,618.80/x
  3. Step 3: Cross multiply
    503,780.20x = 755,670.30 × 389,618.80
  4. Step 4: Simplify right side
    503,780.20x = 294,423,355,481.64
  5. Step 5: Solve for x
    x = 294,423,355,481.64/503,780.20
  6. Step 6: Final answer
    x = 584,428.20

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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.