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Finding the Fourth Proportional to 678,790.69, 936,700.86 and 407,008.60

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Solution

The fourth proportional to 678,790.69, 936,700.86 and 407,008.60 is: 561,653.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,790.69 : 936,700.86 = 407,008.60 : x
  2. Step 2: Convert to fraction form
    678,790.69/936,700.86 = 407,008.60/x
  3. Step 3: Cross multiply
    678,790.69x = 936,700.86 × 407,008.60
  4. Step 4: Simplify right side
    678,790.69x = 381,245,305,647.40
  5. Step 5: Solve for x
    x = 381,245,305,647.40/678,790.69
  6. Step 6: Final answer
    x = 561,653.70

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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.