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Finding the Fourth Proportional to 678,864.10, 936,728.46 and 392,328.94

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Solution

The fourth proportional to 678,864.10, 936,728.46 and 392,328.94 is: 541,353.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,864.10 : 936,728.46 = 392,328.94 : x
  2. Step 2: Convert to fraction form
    678,864.10/936,728.46 = 392,328.94/x
  3. Step 3: Cross multiply
    678,864.10x = 936,728.46 × 392,328.94
  4. Step 4: Simplify right side
    678,864.10x = 367,505,683,779.63
  5. Step 5: Solve for x
    x = 367,505,683,779.63/678,864.10
  6. Step 6: Final answer
    x = 541,353.83

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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.