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Finding the Fourth Proportional to 670,720.25, 925,834.70 and 398,787.50

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Solution

The fourth proportional to 670,720.25, 925,834.70 and 398,787.50 is: 550,469.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    670,720.25 : 925,834.70 = 398,787.50 : x
  2. Step 2: Convert to fraction form
    670,720.25/925,834.70 = 398,787.50/x
  3. Step 3: Cross multiply
    670,720.25x = 925,834.70 × 398,787.50
  4. Step 4: Simplify right side
    670,720.25x = 369,211,308,737.81
  5. Step 5: Solve for x
    x = 369,211,308,737.81/670,720.25
  6. Step 6: Final answer
    x = 550,469.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.