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Finding the Fourth Proportional to 489,841.20, 734,761.80 and 209,905.20

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Solution

The fourth proportional to 489,841.20, 734,761.80 and 209,905.20 is: 314,857.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,841.20 : 734,761.80 = 209,905.20 : x
  2. Step 2: Convert to fraction form
    489,841.20/734,761.80 = 209,905.20/x
  3. Step 3: Cross multiply
    489,841.20x = 734,761.80 × 209,905.20
  4. Step 4: Simplify right side
    489,841.20x = 154,230,322,581.36
  5. Step 5: Solve for x
    x = 154,230,322,581.36/489,841.20
  6. Step 6: Final answer
    x = 314,857.80

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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.