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Finding the Fourth Proportional to 489,905.40, 734,858.10 and 321,943.80

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Solution

The fourth proportional to 489,905.40, 734,858.10 and 321,943.80 is: 482,915.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,905.40 : 734,858.10 = 321,943.80 : x
  2. Step 2: Convert to fraction form
    489,905.40/734,858.10 = 321,943.80/x
  3. Step 3: Cross multiply
    489,905.40x = 734,858.10 × 321,943.80
  4. Step 4: Simplify right side
    489,905.40x = 236,583,009,174.78
  5. Step 5: Solve for x
    x = 236,583,009,174.78/489,905.40
  6. Step 6: Final answer
    x = 482,915.70

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Double scale
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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.