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Finding the Fourth Proportional to 680,684.96, 939,303 and 394,155.20

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Solution

The fourth proportional to 680,684.96, 939,303 and 394,155.20 is: 543,909.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,684.96 : 939,303 = 394,155.20 : x
  2. Step 2: Convert to fraction form
    680,684.96/939,303 = 394,155.20/x
  3. Step 3: Cross multiply
    680,684.96x = 939,303 × 394,155.20
  4. Step 4: Simplify right side
    680,684.96x = 370,231,161,825.60
  5. Step 5: Solve for x
    x = 370,231,161,825.60/680,684.96
  6. Step 6: Final answer
    x = 543,909.71

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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.