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Finding the Fourth Proportional to 678,783.70, 936,691.20 and 407,001.56

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Solution

The fourth proportional to 678,783.70, 936,691.20 and 407,001.56 is: 561,643.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,783.70 : 936,691.20 = 407,001.56 : x
  2. Step 2: Convert to fraction form
    678,783.70/936,691.20 = 407,001.56/x
  3. Step 3: Cross multiply
    678,783.70x = 936,691.20 × 407,001.56
  4. Step 4: Simplify right side
    678,783.70x = 381,234,779,638.27
  5. Step 5: Solve for x
    x = 381,234,779,638.27/678,783.70
  6. Step 6: Final answer
    x = 561,643.98

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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.