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Finding the Fourth Proportional to 500,479.92, 690,441.12 and 393,361.29

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Solution

The fourth proportional to 500,479.92, 690,441.12 and 393,361.29 is: 542,664.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    500,479.92 : 690,441.12 = 393,361.29 : x
  2. Step 2: Convert to fraction form
    500,479.92/690,441.12 = 393,361.29/x
  3. Step 3: Cross multiply
    500,479.92x = 690,441.12 × 393,361.29
  4. Step 4: Simplify right side
    500,479.92x = 271,592,809,632.25
  5. Step 5: Solve for x
    x = 271,592,809,632.25/500,479.92
  6. Step 6: Final answer
    x = 542,664.75

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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.