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Finding the Fourth Proportional to 389,996.10, 584,994.15 and 319,137.30

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Solution

The fourth proportional to 389,996.10, 584,994.15 and 319,137.30 is: 478,705.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,996.10 : 584,994.15 = 319,137.30 : x
  2. Step 2: Convert to fraction form
    389,996.10/584,994.15 = 319,137.30/x
  3. Step 3: Cross multiply
    389,996.10x = 584,994.15 × 319,137.30
  4. Step 4: Simplify right side
    389,996.10x = 186,693,453,546.80
  5. Step 5: Solve for x
    x = 186,693,453,546.80/389,996.10
  6. Step 6: Final answer
    x = 478,705.95

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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.