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Finding the Fourth Proportional to 678,500.56, 936,501 and 392,186.96

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Solution

The fourth proportional to 678,500.56, 936,501 and 392,186.96 is: 541,316.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,500.56 : 936,501 = 392,186.96 : x
  2. Step 2: Convert to fraction form
    678,500.56/936,501 = 392,186.96/x
  3. Step 3: Cross multiply
    678,500.56x = 936,501 × 392,186.96
  4. Step 4: Simplify right side
    678,500.56x = 367,283,480,226.96
  5. Step 5: Solve for x
    x = 367,283,480,226.96/678,500.56
  6. Step 6: Final answer
    x = 541,316.40

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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.