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Finding the Fourth Proportional to 678,607.70, 1,017,911.55 and 620,546.90

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Solution

The fourth proportional to 678,607.70, 1,017,911.55 and 620,546.90 is: 930,820.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,607.70 : 1,017,911.55 = 620,546.90 : x
  2. Step 2: Convert to fraction form
    678,607.70/1,017,911.55 = 620,546.90/x
  3. Step 3: Cross multiply
    678,607.70x = 1,017,911.55 × 620,546.90
  4. Step 4: Simplify right side
    678,607.70x = 631,661,856,826.70
  5. Step 5: Solve for x
    x = 631,661,856,826.70/678,607.70
  6. Step 6: Final answer
    x = 930,820.35

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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.