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Finding the Fourth Proportional to 636,791.45, 878,169.06 and 407,421.32

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Solution

The fourth proportional to 636,791.45, 878,169.06 and 407,421.32 is: 561,855.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,791.45 : 878,169.06 = 407,421.32 : x
  2. Step 2: Convert to fraction form
    636,791.45/878,169.06 = 407,421.32/x
  3. Step 3: Cross multiply
    636,791.45x = 878,169.06 × 407,421.32
  4. Step 4: Simplify right side
    636,791.45x = 357,784,793,217.51
  5. Step 5: Solve for x
    x = 357,784,793,217.51/636,791.45
  6. Step 6: Final answer
    x = 561,855.53

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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.