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Finding the Fourth Proportional to 553,335.78, 763,604.96 and 320,807.90

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Solution

The fourth proportional to 553,335.78, 763,604.96 and 320,807.90 is: 442,715.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,335.78 : 763,604.96 = 320,807.90 : x
  2. Step 2: Convert to fraction form
    553,335.78/763,604.96 = 320,807.90/x
  3. Step 3: Cross multiply
    553,335.78x = 763,604.96 × 320,807.90
  4. Step 4: Simplify right side
    553,335.78x = 244,970,505,383.92
  5. Step 5: Solve for x
    x = 244,970,505,383.92/553,335.78
  6. Step 6: Final answer
    x = 442,715.82

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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.