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Finding the Fourth Proportional to 636,442.35, 878,071.89 and 394,637.91

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Solution

The fourth proportional to 636,442.35, 878,071.89 and 394,637.91 is: 544,464.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,442.35 : 878,071.89 = 394,637.91 : x
  2. Step 2: Convert to fraction form
    636,442.35/878,071.89 = 394,637.91/x
  3. Step 3: Cross multiply
    636,442.35x = 878,071.89 × 394,637.91
  4. Step 4: Simplify right side
    636,442.35x = 346,520,455,499.35
  5. Step 5: Solve for x
    x = 346,520,455,499.35/636,442.35
  6. Step 6: Final answer
    x = 544,464.80

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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.