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Finding the Fourth Proportional to 668,004.78, 921,884.67 and 396,233.58

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Solution

The fourth proportional to 668,004.78, 921,884.67 and 396,233.58 is: 546,824.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    668,004.78 : 921,884.67 = 396,233.58 : x
  2. Step 2: Convert to fraction form
    668,004.78/921,884.67 = 396,233.58/x
  3. Step 3: Cross multiply
    668,004.78x = 921,884.67 × 396,233.58
  4. Step 4: Simplify right side
    668,004.78x = 365,281,663,141.22
  5. Step 5: Solve for x
    x = 365,281,663,141.22/668,004.78
  6. Step 6: Final answer
    x = 546,824.92

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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.