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Finding the Fourth Proportional to 620,652.60, 930,978.90 and 408,076.20

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Solution

The fourth proportional to 620,652.60, 930,978.90 and 408,076.20 is: 612,114.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,652.60 : 930,978.90 = 408,076.20 : x
  2. Step 2: Convert to fraction form
    620,652.60/930,978.90 = 408,076.20/x
  3. Step 3: Cross multiply
    620,652.60x = 930,978.90 × 408,076.20
  4. Step 4: Simplify right side
    620,652.60x = 379,910,331,792.18
  5. Step 5: Solve for x
    x = 379,910,331,792.18/620,652.60
  6. Step 6: Final answer
    x = 612,114.30

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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.