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Finding the Fourth Proportional to 636,272.72, 878,074.53 and 387,929

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Solution

The fourth proportional to 636,272.72, 878,074.53 and 387,929 is: 535,353.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,272.72 : 878,074.53 = 387,929 : x
  2. Step 2: Convert to fraction form
    636,272.72/878,074.53 = 387,929/x
  3. Step 3: Cross multiply
    636,272.72x = 878,074.53 × 387,929
  4. Step 4: Simplify right side
    636,272.72x = 340,630,574,348.37
  5. Step 5: Solve for x
    x = 340,630,574,348.37/636,272.72
  6. Step 6: Final answer
    x = 535,353.10

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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.