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Finding the Fourth Proportional to 613,881.40, 919,266.90 and 489,465.40

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Solution

The fourth proportional to 613,881.40, 919,266.90 and 489,465.40 is: 732,958.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,881.40 : 919,266.90 = 489,465.40 : x
  2. Step 2: Convert to fraction form
    613,881.40/919,266.90 = 489,465.40/x
  3. Step 3: Cross multiply
    613,881.40x = 919,266.90 × 489,465.40
  4. Step 4: Simplify right side
    613,881.40x = 449,949,340,915.26
  5. Step 5: Solve for x
    x = 449,949,340,915.26/613,881.40
  6. Step 6: Final answer
    x = 732,958.09

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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.