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Finding the Fourth Proportional to 636,678.85, 878,979.95 and 422,109.54

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Solution

The fourth proportional to 636,678.85, 878,979.95 and 422,109.54 is: 582,751.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,678.85 : 878,979.95 = 422,109.54 : x
  2. Step 2: Convert to fraction form
    636,678.85/878,979.95 = 422,109.54/x
  3. Step 3: Cross multiply
    636,678.85x = 878,979.95 × 422,109.54
  4. Step 4: Simplify right side
    636,678.85x = 371,025,822,363.72
  5. Step 5: Solve for x
    x = 371,025,822,363.72/636,678.85
  6. Step 6: Final answer
    x = 582,751.92

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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.