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Finding the Fourth Proportional to 553,393.67, 763,684.79 and 320,865.75

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Solution

The fourth proportional to 553,393.67, 763,684.79 and 320,865.75 is: 442,795.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,393.67 : 763,684.79 = 320,865.75 : x
  2. Step 2: Convert to fraction form
    553,393.67/763,684.79 = 320,865.75/x
  3. Step 3: Cross multiply
    553,393.67x = 763,684.79 × 320,865.75
  4. Step 4: Simplify right side
    553,393.67x = 245,040,291,302.61
  5. Step 5: Solve for x
    x = 245,040,291,302.61/553,393.67
  6. Step 6: Final answer
    x = 442,795.62

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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.