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Finding the Fourth Proportional to 515,939.90, 773,909.85 and 389,968.70

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Solution

The fourth proportional to 515,939.90, 773,909.85 and 389,968.70 is: 584,953.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,939.90 : 773,909.85 = 389,968.70 : x
  2. Step 2: Convert to fraction form
    515,939.90/773,909.85 = 389,968.70/x
  3. Step 3: Cross multiply
    515,939.90x = 773,909.85 × 389,968.70
  4. Step 4: Simplify right side
    515,939.90x = 301,800,618,121.70
  5. Step 5: Solve for x
    x = 301,800,618,121.70/515,939.90
  6. Step 6: Final answer
    x = 584,953.05

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Similar ratio
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1.5x scale

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.