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Finding the Fourth Proportional to 394,400.71, 545,192.40 and 351,802.38

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Solution

The fourth proportional to 394,400.71, 545,192.40 and 351,802.38 is: 486,307.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,400.71 : 545,192.40 = 351,802.38 : x
  2. Step 2: Convert to fraction form
    394,400.71/545,192.40 = 351,802.38/x
  3. Step 3: Cross multiply
    394,400.71x = 545,192.40 × 351,802.38
  4. Step 4: Simplify right side
    394,400.71x = 191,799,982,118.90
  5. Step 5: Solve for x
    x = 191,799,982,118.90/394,400.71
  6. Step 6: Final answer
    x = 486,307.40

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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.