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Finding the Fourth Proportional to 612,137.80, 918,206.70 and 413,072.20

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Solution

The fourth proportional to 612,137.80, 918,206.70 and 413,072.20 is: 619,608.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,137.80 : 918,206.70 = 413,072.20 : x
  2. Step 2: Convert to fraction form
    612,137.80/918,206.70 = 413,072.20/x
  3. Step 3: Cross multiply
    612,137.80x = 918,206.70 × 413,072.20
  4. Step 4: Simplify right side
    612,137.80x = 379,285,661,623.74
  5. Step 5: Solve for x
    x = 379,285,661,623.74/612,137.80
  6. Step 6: Final answer
    x = 619,608.30

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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.