Home / 664,981.85-917,680.82-378,520.38

Finding the Fourth Proportional to 664,981.85, 917,680.82 and 378,520.38

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Solution

The fourth proportional to 664,981.85, 917,680.82 and 378,520.38 is: 522,361.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,981.85 : 917,680.82 = 378,520.38 : x
  2. Step 2: Convert to fraction form
    664,981.85/917,680.82 = 378,520.38/x
  3. Step 3: Cross multiply
    664,981.85x = 917,680.82 × 378,520.38
  4. Step 4: Simplify right side
    664,981.85x = 347,360,890,812.51
  5. Step 5: Solve for x
    x = 347,360,890,812.51/664,981.85
  6. Step 6: Final answer
    x = 522,361.46

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Double scale
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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.