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Finding the Fourth Proportional to 636,430.20, 878,305.24 and 394,790.62

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Solution

The fourth proportional to 636,430.20, 878,305.24 and 394,790.62 is: 544,830.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,430.20 : 878,305.24 = 394,790.62 : x
  2. Step 2: Convert to fraction form
    636,430.20/878,305.24 = 394,790.62/x
  3. Step 3: Cross multiply
    636,430.20x = 878,305.24 × 394,790.62
  4. Step 4: Simplify right side
    636,430.20x = 346,746,670,248.85
  5. Step 5: Solve for x
    x = 346,746,670,248.85/636,430.20
  6. Step 6: Final answer
    x = 544,830.64

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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.