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Finding the Fourth Proportional to 678,777.28, 936,658.02 and 392,315.92

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Solution

The fourth proportional to 678,777.28, 936,658.02 and 392,315.92 is: 541,364.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,777.28 : 936,658.02 = 392,315.92 : x
  2. Step 2: Convert to fraction form
    678,777.28/936,658.02 = 392,315.92/x
  3. Step 3: Cross multiply
    678,777.28x = 936,658.02 × 392,315.92
  4. Step 4: Simplify right side
    678,777.28x = 367,465,852,841.68
  5. Step 5: Solve for x
    x = 367,465,852,841.68/678,777.28
  6. Step 6: Final answer
    x = 541,364.40

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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.