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Finding the Fourth Proportional to 613,771.40, 919,101.90 and 489,355.40

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Solution

The fourth proportional to 613,771.40, 919,101.90 and 489,355.40 is: 732,793.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,771.40 : 919,101.90 = 489,355.40 : x
  2. Step 2: Convert to fraction form
    613,771.40/919,101.90 = 489,355.40/x
  3. Step 3: Cross multiply
    613,771.40x = 919,101.90 × 489,355.40
  4. Step 4: Simplify right side
    613,771.40x = 449,767,477,915.26
  5. Step 5: Solve for x
    x = 449,767,477,915.26/613,771.40
  6. Step 6: Final answer
    x = 732,793.15

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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.