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Finding the Fourth Proportional to 489,123.90, 733,685.85 and 320,724.90

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Solution

The fourth proportional to 489,123.90, 733,685.85 and 320,724.90 is: 481,087.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,123.90 : 733,685.85 = 320,724.90 : x
  2. Step 2: Convert to fraction form
    489,123.90/733,685.85 = 320,724.90/x
  3. Step 3: Cross multiply
    489,123.90x = 733,685.85 × 320,724.90
  4. Step 4: Simplify right side
    489,123.90x = 235,311,320,872.67
  5. Step 5: Solve for x
    x = 235,311,320,872.67/489,123.90
  6. Step 6: Final answer
    x = 481,087.35

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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.